RETRACTION Retraction: Ph processing in

available at the end of the article This article [1] has been retracted by the publisher because of significant overlap with figures from previously published work [2,3] without appropriate attribution or permissions. We were unable to contact the authors of the article, despite our best efforts. We apologise to all affected parties for the inconvenience caused. Submit your next manuscript to BioMed Central Sharma and Sharma BioMedical Engineering OnLine 2013, 12:11