Gill Kanwar R S, Hasan Muhammad K, Menke David M, Wallace Michael B
Department of Gastroenterology, Mayo Clinic, Jacksonville, Florida, USA.
Gastrointest Endosc. 2010 Apr;71(4):849; discussion 849-50. doi: 10.1016/j.gie.2009.11.031. Epub 2010 Feb 25.