Correction: The development of paper microfluidic devices for presumptive drug detection

A source of support was omitted from the Acknowledgements section of the manuscript. The Acknowledgements section is updated to read: Giacomo Musile is supported by a research grant awarded by the Italian Ministry of University and Scientic Research (FIRB2012 # RBFR12LD0W_003). Ling Wang is supported by a Presidential Fellowship awarded by the University Graduate School of Florida International University. Jashaun Bottoms is supported by the NSF-REU Site grant no. CHE1156886 to FIU. The authors also gratefully acknowledge funding through NIJ grant 2013-DN-BXK032. Points of view in the document are those of the authors and do not necessarily represent the official view of the U.S. Department of Justice. G. Musile and L. Wang contributed equally to the scholarship of this paper. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.