The Editor-in-Chief and the Publisher have retracted this article. The article was submitted to be part of a guest-edited issue. An investigation by the publisher found a number of articles, including this one, with a number of concerns, including but not limited to compromised editorial handling and peer review process, inappropriate or irrelevant references or not being in scope of the journal or guest-edited issue. Based on the investigation's findings the Editor-in-Chief therefore no longer has confidence in the results and conclusions of this article. The author has not responded to any correspondence from the editor/publisher about this retraction. The online version of this article contains the full text of the retracted article as Supplementary Information.