Dr. Lin Chang is a gastroenterology professor at UCLA's David Geffen School of Medicine.

Lin Chang 博士是加州大学洛杉矶分校大卫格芬医学院的胃肠病学教授。

" The other thing is making sure that your bowel habits are regular, " said Dr. William Chey, a professor of gastroenterology at the University of Michigan.

密歇根大学胃肠病学教授威廉·崔博士说：“保持规律排便也很关键。