Cheng Derek W, Han Nancy J, Mehdizadeh Shahab, Lo Simon K
Department of Gastroenterology, Cedars-Sinai Medical Center, University of California, Los Angeles School of Medicine, Los Angeles, California 90048, USA.
Gastrointest Endosc. 2007 Sep;66(3):627-9. doi: 10.1016/j.gie.2006.12.003. Epub 2007 May 24.