Wayman John, Irving Mark, Russell Nicholas, Nicoll Jonathon, Raimes Simon A
Northern Oesophago-Gastric Cancer Unit, North Cumbria NHS Trust, Cumberland Infirmary, Carlisle, UK.
Gastrointest Endosc. 2004 Jun;59(7):927-9. doi: 10.1016/s0016-5107(04)00339-6.