[1] Sichuan North Med Coll, Dept Pathophysiol, Nanchong 637100, Peoples R China
[2] Seventh Peoples Hosp Chengdu, Dept Gen Surg, Chengdu 610041, Peoples R China
[3] Kunming Med Univ, Dept Resp Dis, Affiliated Hosp 1, Kunming 650032, Peoples R China
[4] Sichuan Univ, West China Hosp, Dept Resp Med, Chengdu 610041, Peoples R China