Holinga Julie, Khalid Asif, Fasanella Kenneth, Sanders Michael, Davison Jon, McGrath Kevin
Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA.
Gastrointest Endosc. 2012 Apr;75(4):913-6. doi: 10.1016/j.gie.2011.11.032. Epub 2012 Jan 26.