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 Asadi Srinivasulu ** disagrees with this retraction. The authors K. Ramanjaneyulu, R. Neelaveni, Santoshachandra Rao Karanam, Sankararao Majji, Muthukumaran Jothilingam & Tulasi Radhika Patnala have not responded to correspondence regarding this retraction. The online version of this article contains the full text of the retracted article as Supplementary Information.