1. National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, P.R. China
2. College of Biomedical Engineering, Sichuan University, Chengdu 610065, P.R. China
3. Department of Respiratory and Critical Care Medicine, Targeted Tracer Research and Development Laboratory, West China Hospital, Sichuan University, Chengdu, Sichuan 610065, China