1. College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
2. The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, P. R. China
3. Department of Plastic and Burn Surgery, West China School of Medicine, West China Hospital, Sichuan University, Chengdu 610041, China