von Bartheld Martin B, van Kralingen Klaas W, Veenendaal Roeland A, Willems Luuk N, Rabe Klaus F, Annema Jouke T
Department of Pulmonology, Leiden University Medical Center, Leiden, The Netherlands.
Gastrointest Endosc. 2010 Jan;71(1):210-2. doi: 10.1016/j.gie.2009.07.001. Epub 2009 Aug 15.