Editorial Board Editors: Editor-in-Chief Yoshiki HIROOKA, Department of Liver, Biliary Tract and Pancreas Diseases, Fujita Health University, Aichi, Japan Deputy Editor-in–Chiefs Hiroyuki HACHIYA, School of Engineering, Tokyo Institute of Technology, Tokyo, Japan Kazushi NUMATA, Gastroenterological Center, Yokohama City University Medical Center, Kanagawa, Japan Associate Editors Akihiko KIKUCHI, Center for Maternal, Fetal and Neonatal Medicine, Department of Obstetrics and Gynecology, Saitama Medical Center, Saitama Medical University, Saitama, Japan Anthony N. DEMARIA, University of California, UCSD Medical Center, San Diego, USA Atsushi OCHIAI, Department of Urology, Matsushita Memorial Hospital, Osaka, Japan Chisato WATANABE, Department of Orthopedic Surgery, Kawabata Hospital, Kyoto, Japan Chris L. de KORTE, Medical UltraSound Imaging Centre (766 MUSIC), Radboud University Medical Üentre,Nijmegen, The Netherlands Eizaburo OHNO, Department of Gastroenterology and Hepatology, Nagoya University Graduate School of Medicine, Aichi, Japan Hideo KOBAYASHI, Department of Respiratory Diseases, National Defense Medical School, Saitama, Japan Hideyuki HASEGAWA, Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Japan Hiroshi KATAYAMA, Department of Pediatrics, Osaka Medical College, Osaka, Japan Hirotoshi HAMAGUCHI, Department of Neurology, Kita-harima Medical Center, Hyogo, Japan Katsufumi MIZUSHIGE, National Hospital Organization, Takamatsu Medical Center, Kagawa, Japan Kazuhiko YOSHIMOTO, Department of pediatric surgery, Japanese Red Cross Kumamoto hospital, Kumamoto, Japan Kazutaka NAKASHIMA, Department of General Surgery, Kawasaki Medical School, Okayama, Japan Kazuhiro NISHIGAMI, Miyuki Hospital LTAC Heart Failure Center, Kumamoto, Japan Kiyotake ICHIZUKA, Department of Obstetrics and Gynecology, Showa University Northern Yokohama Hospital, Kanagawa, Japan Koji OKIHARA, Department of Urology, North Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan Mamoru TANAKA, Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan Masumi IWAI-TAKANO, Intensive Care Unit, Fukushima Medical University Hospital, Fukushima, Japan Nobuki KUDO, Graduate School of Information Science and Technology, Hokkaido University, Hokkaido, Japan Satoshi YAMADA, Department of Cardiology, Tokyo Medical University Hachioji Medical Center, Tokyo, Japan Shinichi SUZUKI, Department of Thyroid and Endocrinology, Fukushima Medical University School of Medicine, Fukushima, Japan Shin-ichiro UMEMURA, Graduate School of Biomedical Engineering, Tohoku University, Miyagi, Japan Shinji OKANIWA, Department of Gastroenterology, Iida Municipal Hospital, Nagano, Japan Shinji TANIGAKI, Department of Obstetrics and Gynecology, Kyorin University School of Medicine, Tokyo, Japan Shoichi MATSUTANI, Department of Gastroenterology, Funabashi Municipal Medical Center, Chiba, Japan Toshikazu ITO, Department of Thoracic, Breast, Endocrine and Pediatric Surgery, School of Medicine, Fukuoka University, Fukuoka, Japan Yuko NAKASHIMA, Collaborative Research Laboratory of Musculoskeletal Ultrasound in Medicine Hiroshima University, Hiroshima, Japan Yutaka OTSUJI, Second Department of Internal Medicine, University of Occupational and Environmental Health, Fukuoka, Japan Yasuharu IMAI, AMS Palace Building Clinic, Tokyo, Japan Yasutomo FUJII, Department of Human Health Science, Kyoto University Graduate School of Medicine, Kyoto, Japan Overseas Scientific Advisory Board: Ahm KIM, Department of Obstetrics and Gynecology, College of Medicine, University of Ulsan, Asan Medical Center, Korea Fernando BONILLA-MUSOLES, Department of Obstetrics and Gynecology, Valencia School of Medicine, Spain Jens E. WILHJELM, Biomedical Engineering, Technical University of Denmark, Lyngby, Denmark Feng WU, HIFU Unit, The Churchill Hospital, Oxford University Hospitals, Oxford, UK Magnus CINTHIO, Department of Electrical Measurements, Lund Institute of Technology, Lund University, Lund, Sweden Ming-De Lu, Department of Medical Ultrasonics & Department of Hepatobiliary Surgery, The First Affi liated Hospital, Sun Yat-Sen University, Guangzhou, People’s Republic of China Paul A.CAMPBELL, Physics & Carnegie Physics Laboratory, University of Dundee, Nethergate, UK Yi WANG, Department of Ultrasound, Huashan Hospital, Fudan University, Shanghai, Peoples’ Republic of China Scientific Advisory Board: Physics & Engineering Hirofumi TAKI, MaRI Co., Ltd., Miyagi, Japan Hisashi MASUGATA, Department of General Internal Medicine, Kagawa University, Kagawa, Japan Iwaki AKIYAMA, Faculty of Life and Medical Sciences, Doshisha University, Kyoto, Japan Katsuro TACHIBANA, Department of Anatomy, Fukuoka University School of Medicine, Fukuoka, Japan Kengo KONDO, Department of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan Kenji YOSHIDA, Center for Frontier Medical Engineering, Chiba University, Chiba, Japan Kohji MASUDA, Tokyo University of Agriculture and Technology, Tokyo, Japan Makoto YAMAKAWA, Graduate School of Medicine, Kyoto University, Kyoto, Japan Masayuki TANABE, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, Japan Mototaka ARAKAWA, Graduate School of Biomedical Engineering, Tohoku University, Miyagi, Japan Naohiko TANAKA, College of Systems Engineering and Science, Shibaura Institute of Technology, Saitama, Japan Naotaka NITTA, Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan Norio TAGAWA, Faculty of Systems Design, Tokyo Metropolitan University, Tokyo, Japan Ryo NAGAOKA, Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Japan Shin YOSHIZAWA, Department of Communications Engineering, Tohoku University, Miyagi, Japan Shinichi TAKEUCHI, Department of Clinical Engineering, Faculty of Biomedical Engineering, Toin University of Yokohama, Kanagawa, Japan Shinnosuke HIRATA, Department of Systems and Control Engineering, School of Engineering, Tokyo Institute of Technology, Tokyo, Japan Shohei MORI, Department of Electronic Engineering, Tohoku University, Miyagi, Japan Tadashi YAMAGUCHI, Center for Frontier Medical Engineering, Chiba University, Chiba, Japan Takashi KONDO, Division of Radiation Oncology, Department of Radiology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan Takashi AZUMA, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, Tokyo, Japan Takenobu TSUCHIYA, Department of Electrical, Electronics and Information, Faculty of Engineering, Kanagawa University, Kanagawa, Japan Tsuneo KIKUCHI, Human Resources Division, General Affairs Headquarters, Advanced Industrial Science and Technology (AIST), Ibaraki, Japan Yoshifumi SAIJO, Graduate School of Biomedical Engineering, Tohoku University, Miyagi, Japan Yoshiki YAMAKOSHI, Graduate School of Science and Technology, Gunma University, Gunma, Japan Cardiology Akiko GODA, Department of Internal Medicine, Cardiovascular Division / Division of Coronary Heart Disease, Hyogo College of Medicine, Hyogo, Japan Hidekazu TANAKA, Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Hyogo, Japan Hirotsugu YAMADA, Department of Community Medicine for Cardiology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan Hiroyuki IWANO, Department of Cardiovascular Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Hokkaido, Japan Kaoru DOHI, Department of Cardiology and Nephrology, Mie University Graduate School of Medicine, Mie, Japan Katsuji INOUE, Department of Cardiology, Pulmonology, Hypertension & Nephrology, Ehime University Graduate School of Medicine, Ehime, Japan Ken TAKAHASHI, Department of Pediatrics, Juntendo University Faculty of Medicine, Tokyo, Japan Kensuke MATSUMOTO, Department of Internal Medicine Division of Cardiovascular Medicine, Kobe University Graduate School of Medicine, Hyogo, Japan Kenya KUSUNOSE, Department of Cardiovascular Medicine, Tokushima University Hospital, Tokushima, Japan Kumiko HIRATA, Osaka Educational University, Osaka, Japan Masaki NII, Department of Cardiology, Shizuoka Children’s Hospital, Shizuoka, Japan Masaki IZUMO, Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Kanagawa, Japan Nobuyuki OHTE, Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Aichi, Japan Nozomi WATANABE, Miyazaki Medical Association Hospital Cardiovascular Center, Miyazaki, Japan Satoshi YUDA, Department of Cardiology, Teine Keijinkai Hospital, Hokkaido, Japan Takahiro OHARA, Division of Community Medicine, Tohoku Medical and Pharmaceutical University, Miyagi, Japan Takeshi ARITA, Heart Center, Kyushu University Hospital, Fukuoka, Japan Tetsuari ONISHI, Department of Cardiology, Himeji Cardiovascular Center, Hyogo, Japan Toshinari ONISHI, Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, Osaka, Japan Yasuaki WADA, Division of Clinical Laboratory, Yamaguchi University Hospital, Yamaguchi, Japan Yasuyoshi TAKEI, Department of Cardiology, Tokyo Medical University, Tokyo, Japan Yoko MIYASAKA, Division of Cardiology, Department of Medicine II, Kansai Medical University, Osaka, Japan Yukio ABE, Department of Cardiology, Osaka City General Hospital, Osaka, Japan Yutaka HIRANO, Department of Central Clinical Laboratory, Kindai University Hospital, Osaka, Japan Gastroenterology Eii KARASAWA, Department of Gastroenterology, Watanabe clinic, Nasushiobara, Tochigi, Japan Hidekatsu KURODA, Division of Hepatology, Department of Internal Medicine, Iwate Medical University, Iwate, Japan Hidekazu ITOH, Gastroenterological Centre, Saiseikai-Arida Hospital Imperial Gift Funded, Wakayama, Japan Hidenari NAGAI, Division of Gastroenterology and Hepatology, Department of Internal Medicine (Omori), School of Medicine, Faculty of Medicine, Toho University, Tokyo, Japan Hiroko NAGANUMA, Department of Gastroenterology, Yokote Municipal Hospital, Akita, Japan Hironao OKUBO, Department of Gastroenterology, Juntendo University Nerima Hospital, Tokyo, Japan Hironori TANAKA, Department of Gastroenterology and Hepatology, Takarazuka Municipal Hospital, Hyogo, Japan Hiroyoshi ONODERA, Cancer Detection Center of Miyagi Cancer Society, Miyagi, Japan Hitoshi MARUYAMA, Department of Gastroenterology, Juntendo University, Tokyo, Japan Katsutoshi SUGIMOTO, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo, Japan Kazue SHIOZAWA, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Toho University Medical Center, Ohashi Hospital, Tokyo, Japan Keiko KORENAGA, Health care center, JCHO Funabashi Central Hospital, Chiba, Japan Kenichiro HIRATA, Department of Gastroenterology, Sapporo Kyoritsu Gorinbashi Hospital, Hokkaido, Japan Kentaro YOSHIOKA, Department of Liver, Biliary Tract and Pancreas Diseases, Fujita Health University, Aichi, Japan Manabu WATANABE, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Toho University Medical Center, Ohashi Hospital, Tokyo, Japan Masahiko KODA, Department of internal medicine, Hino Hospital, Tottori, Japan Masahiro OGAWA, Department of Gastroenterology and Hepatology, Nihon University Hospital, Tokyo, Japan Masatoshi TANAKA, Clinical Research Center, and Department of Hepatology, Yokokura Hospital, Fukuoka, Japan Masayuki KITANO, Second Department of Internal Medicine, Wakayama Medical University, Wakayama, Japan Naoki MATSUMOTO, Division of Gastroenterology and Hepatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan Norihisa YADA, Yada Clinic, Kyoto, Japan Noritaka WAKUI, Division of Gastroenterology and Hepatology, Toho University Omori Medical Center, Tokyo, Japan Satoshi SAITOH, Department of Hepatology, Toranomon Hospital, Tokyo, Japan Takashi KUMADA, Department of Gastroenterology and Hepatology, Ogaki Municipal Hospital, Gifu, Japan Takashi NISHIMURA, Department of Internal Medicine, Division of Hepatobiliary and Pancreatic Disease, Ultrasound Imaging Center, Hyogo College of Medicine, Hyogo, Japan Taketoshi FUJIMOTO, Department of Surgery, IMS Fujimi General Hospital, Saitama, Japan Toshifumi TADA, Department of Gastroenterology and Hepatology, Ogaki Municipal Hospital, Gifu, Japan Toshihiko KAWASAKI, Department of Gastroenterology and Hepatology, Kindai University Nara Hospital, Nara, Japan Yasuharu IMAI, Department of Gastroenterology, Ikeda Municipal Hospital, Osaka, Japan Yasunori MINAMI, Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Osaka, Japan Breast & Thyroid Ako ITOH, Department of Breast and Thyroid Surgery, Hitachi General Hospital, Ibaraki, Japan Etsuo TAKADA, Center of Medical Ultrasonics, Dokkyo Medical University, Tochigi, Japan Hiroki SHIMURA, Department of Laboratory Medicine, Fukushima Medical University, Fukushima, Japan Hiroko BANDO, Department of Breast and Endocrine Surgery, Faculty of Medicine, University of Tsukuba，Ibaraki, Japan Kanako BAN, Department of Cancer Detection and Diagnosis, Tokyo Health service Association, Tokyo, Japan Kazunori KUBOTA, Department of Medical Informatics, Medical, Hospital, Tokyo Medical and Dental University, Tokyo, Japan Mitsuhiro FUKUSHIMA, Department of Surgery, Kuma Hospital, Hyogo, Japan Ryuzo SEKIGUCHI, Department of Radiology, Toho University Ohashi Medical Center, Tokyo, Japan Toshitaka OKUNO, Department of Breast Surgery, Kobe City Nishi-Kobe Medical Center, Hyogo, Japan Tsukasa MURAKAMI, Department of Endocrinology, Noguchi Thyroid Clinic and Hospital Foundation, Oita, Japan Tsutomu TAKASHIMA, Department of Surgical Oncology, Osaka city University Graduate School of Medicine, Osaka, Japan Tsuyoshi SHIINA, Department of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan Yasuhisa FUJIMOTO, Breast Center, Suita Tokushukai Hospital, Osaka, Japan Obstetrics & Gynecology Atsushi TAJIMA, Department of Obstetrics and Gynecology, Kameda Medical Center, Chiba, Japan Atsushi KOMATSU, Department of Obstetrics & Gynecology, Nihon University School of Medicine, Tokyo, Japan Eiji RYO, Department of Obstetrics and Gynecology, Teikyo University, School of Medicine, Tokyo, Japan Hitoshi ISHIMOTO, Department of Obstetrics and Gynecology, Specialized Clinical Science, Tokai University School of Medicine, Kanagawa, Japan Jun KAKOGAWA, Department of Obstetrics and Gynecology, Tokyo Women’s Medical University, Kanagawa, Japan Junichi HASEGAWA, Department of Obstetrics and Gynecology, St. Marianna University School of Medicine, Kawasaki, Japan Kei MIYAKOSHI, Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan Keisuke ISHII, Department of Maternal Fetal Medicine, Osaka Women’s and Children’s Hospital, Osaka, Japan Koichi KOBAYASHI, Department of Obstetrics and Gynecology, Tokyo Yamate Medical Center, Tokyo, Japan Koichiro KIDO, Department of Obstetrics & Gynecology, Teikyo University, School of Medicine, Tokyo, Japan Makoto EMOTO, Division of Gynecology, Fukuoka Sanno Hospital, International University of Health and Welfare, Fukuoka, Japan Masahiko NAKATA, Department of Obstetrics and Gynecology, Toho University Graduate School of Medicine, Tokyo, Japan Nobuhiro HIDAKA, Department of Obstetrics and Gynecology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan Satoshi HAYASHI, Department of Obstetrics and Gynecology, Tokyo Mother`s Clinic, Tokyo, Japan Shintaro MAKINO, Department of Obstetrics and Gynecology, Juntendo University Faculty of Medicine, Tokyo, Japan Shoji SATOH, Maternal and Perinatal Center, Oita Prefectural Hospital, Oita, Japan Takao SEKIYA, Department of Obstetrics and Gynecology, Fujita Health University School of Medicine, Aichi, Japan Takeshi MURAKOSHI, Obstetrics and Gynecology, Maternal and Perinatal Care Center, Seirei Hamamatsu General Hospital, Shizuoka, Japan Toshiyuki HATA, Department of Perinatology and Gynecology, Kagawa University Graduate School of Medicine, Kagawa, Japan Toshiyuki YOSHIZATO, Department of Obstetrics and Gynecology, School of Medicine, Kurume University, Fukuoka, Japan Yasushi NAKAMURA, Director, FMC Tokyo Clinic, Tokyo, Japan Yoshimasa KAMEI, Department of Obstetrics and Gynecology, Saitama Medical University Hospital, Saitama, Japan Yuichiro TAKAHASHI, Department of fetal-maternal medicine, obstetrics, Nagara medical center, Gifu, Japan Yuka YAMAMOTO, Department of Obstetrics and Gynecology, Juntendo University Urayasu Hospital, Chiba, Japan Urology Fumiya HONGO, Department of Urology, Kyoto Prefectural University of Medicine, Kyoto, Japan Kazumi KAMOI, Director of Robotic Surgery Center, Saiseikai Shiga Hospital, Shiga, Japan Masahiro JINZAKI, Department of Radiology, Keio University School of Medicine, Tokyo, Japan Osamu ISHIZUKA, Department of Urology, Shinshu University School of Medicine, Nagano, Japan So Ushijima, Department of Urology, Omihachiman Community Medical Center, Shiga, Japan Soichi MUGIYA, Department of Urology and Endoscopic Surgery Center, Suzukake Central Hospital, Shizuoka, Japan Tokunori YAMAMOTO, Department of Urology, Nagoya University School of Medicine, Aichi, Japan Tomonori MINAGAWA, Department of Urology, Shinshu University School of Medicine, Nagano, Japan Tsuyoshi IWATA, Department of Urology, Kyoto Prefectural University of Medicine, Kyoto, Japan Orthopedics Hideyuki GOTO, Department of Sports and Fitness, Shigakkann University, Aichi, Japan Hiroshi NAKAJIMA, Department of Orthopaedics, St. Marianna University School of Medicine, Kanagawa, Japan Kenta FUJIWARA, Department of Orthopaedic Surgery, Osaka Medical College, Osaka Japan Masao KUROKAWA, Department of Orthopaedic surgery, Saiseikai Suita Hospital, Osaka, Japan Nobuyuki YAMAMOTO, Department of Orthopaedic Surgery, Tohoku University School of Medicine, Miyagi, Japan Shu TAKAHASHI, East Aoba Orthopedics Clinic, Miyagi, Japan Soichi HATTORI, Department of Sports Medicine, Kameda Medical Center, Chiba, Japan Pediatrics Atsushi MATSUMOTO, Department of Pediatrics, School of Medicine, Iwate Medical University, Morioka, Japan Tatsuo KONO, Department of Radiology, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan Vessels Hidehiro TAKEKAWA, Stroke Center, Dokkyo Medical University Hospital, Tochigi, Japan Hiroshi SATO, Department of Central clinical laboratory, Kansai Electric Power Hospital, Osaka, Japan Hiroshi MATSUO, Matsuo Medical Clinic、Osaka, Japan Kaoru KOMURO, Department of Cardiology, National Hospital Organization Hakodate Hospital, Hokkaido, Japan Kazumi AKASAKA, Medical Laboratory and Blood Center, Asahikawa Medical University Hospital, Hokkaido, Japan Keita ODASHIRO, Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medicine, Fukuoka, Japan Kentaro FUJISHIRO, Toho University, Tokyo, Japan Kozue SAITO, Department of Neurology, Stroke Center, Nara Medical University, Nara, Japan Mika BANDO, Community medicine for Cardiology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan Naoko MIZUKAMI, Division of Clinical Laboratory, Kagoshima University Hospital, Kagoshima, Japan Naoyuki YOKOYAMA, Department of Internal Medicine, Division of Cardiology, Teikyo University School of medicine, Tokyo, Japan Shiro YAMACHIKA, Department of Cardiology, Shunkaikai Inoue Hospital, Nagasaki, Japan Susumu NISHIO, Ultrasound examination center, Tokushima University Hospital, Tokushima, Japan Takanori YASU, Department of Cardiovascular Medicine & Nephrology, Dokkyo Medical University Nikko Medical Center, Tochigi, Japan Tetsuya YAMAMOTO, Central Laboratory, Saitama Medical University International Medical Center, Saitama, Japan Tomoko ISHIZU, Department of Clinical Laboratory Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan Tsuneyoshi YAKUWA, Department of Clinical Functional Physiology，Toho University Medical Center Omori Hospital, Tokyo, Japan Tsuyoshi YOSHIMUTA, Department of Cardiovascular Medicine, Nagasaki University Hospital, Nagasaki, Japan Yoshinori KUBOTA, Department of Clinical Laboratory, Kita-harima Medical Center, Hyogo, Japan Miscellaneous Area Akihiro SUZUKI, Department of Anesthesiology, Jikei University School of Medicine, Tokyo, Japan Hiroshi NATORI, Honorary Director, Nishioka Hospital, Hokkaido, Japan Jo FUKIYAMA, Fukiyama Eye & ENT clinic, Miyazaki, Japan Kazuhiro SHIMAMOTO, Department of Radiological Sciences, Nagoya University Graduate School of Medicine, Aichi, Japan Kei KONNO, Department of Clinical Laboratory Medicine, Jichi Medical University School of Medicine, Tochigi, Japan Kiyoka OMOTO, Department of Laboratory Medicine, Jichi Medical University, Saitama Medical Center, Saitama, Japan Ko ICHIHASHI, Department of Pediatrics, Jichi Medical University Saitama Medical Center, Saitama, Japan Koichiro SHIGETA, Department of Internal Medicine, Kirishima Medical center, Kagoshima, Japan Madoka K FURUKAWA, Department of Head and Neck Surgery, Kanagawa Cancer Center, Kanagawa, Japan Mutsumi NISHIDA, Division of Laboratory and Transfusion Medicine/ Diagnostic Center for Sonography, Hokkaido University Hospital, Hokkaido, Japan Ritsuko YAMADA, Department of Ophthalmology, Yokohama City University School of Medicine, Kanagawa, Japan Satoshi KANEDA, Department of Radiology, Saiseikai Central Hospital, Tokyo, Japan Takako SHIRAKAWA, Graduate School of Human Health Science, Department of Radiological Science, Tokyo Metropolitan University, Tokyo, Japan Tomoyuki OHTA, Department of Radiology, Diagnostic Ultrasound Center, Jikei University School of Medicine, Tokyo, Japan Biostatistical Reviewer Tomomi HIGASHI, Departments of Hygiene, Graduate School of Medical Sciences, Kanazawa University, Ishikawa, Japan
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