- Correspondence to Dr Ruqi Tang and Professor Xiong Ma, Renji Hospital, School of Medicine, Shanghai Jiao Tong University; Shanghai Institute of Digestive Disease, 145 Middle Shandong Road, Shanghai 200001, China; ,
- Received October 31, 2018
- Revised May 24, 2019
- Accepted May 25, 2019
- First published June 14, 2019.