Saunders Brian P, Tsiamoulos Zacharias P, Thomas Huw, Warusavitarne Janindra
Wolfson unit for Endoscopy, St Mark's Hospital and Academic Institute, Harrow, London, UK.
Gastroenterology. 2013 Nov;145(5):939-41. doi: 10.1053/j.gastro.2013.08.057. Epub 2013 Sep 5.