“Doc, What’s an O-G-D-S?” – Dr Chiam Keng Hoong by Dr. Khoo Yoong Khean • August 22, 2014 • 0 Comments Having a tube down your throat is something people don’t take lightly. The nightmarish thought of inserting a long tube from the mouth down to the early portions of the small intestine is not only scary but utterly outrageous for… Read more →