- Correspondence to Professor Fan Feng, The Air Force Medical University, Xi’an, China; ; Professor Hongwei Zhang, Digestive Diseases Center, Wuxi Mingci Hospital, Wuxi, Jiangsu, People's Republic of China;
- Received February 26, 2021
- Revised April 22, 2021
- Accepted April 29, 2021
- First published July 12, 2021.
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