1. National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, Sichuan 610064, China
2. Department of Gastroenterology, the 3rd People's Hospital of Chengdu, Southwest Jiaotong University, Chengdu, Sichuan 610064, China
3. Sichuan Testing Centre for Biomaterials and Medical Devices, Chengdu, Sichuan 610064, China