Before surgery and at 3 and 6 months postoperatively, the investigators measured H2 levels indicative of bacterial overgrowth, gastrointestinal-related quality of life, serologies, and weight loss.

• 在术前与术后3、6个月之后，研究者测量代表细菌过度增生的H2浓度、肠胃道相关生活品质、血清学与减重。