[The China expert consensus of clinical practice for magnetically controlled capsule gastroscopy (2017, Shanghai)] - Digestive Endoscopy Committee of Chinese Endoscopist Association, Digestive Endoscopy Health Management and Checkup Committee of Chinese Endoscopist Association, Capsule Endoscopy Group of the Chinese Society of Digestive Endoscopy, et al (Zhonghua Nei Ke Za Zhi, 2017)