Simpson Lijo, Sundaresan Ramamoorthy, Vohra Mala, Sheagren John, Cougar Derin, August Carey, Ali Imran
Department of Internal Medicine, Advocate Illinois Masonic Medical Center, Chicago, USA.
Gastrointest Endosc. 2005 Jun;61(7):926-8. doi: 10.1016/s0016-5107(04)02842-1.