[1] Zhengzhou Univ, Dept Resp Med, Affiliated Hosp 1, Zhengzhou 450052, Henan, Peoples R China
[2] Zhengzhou Univ, Coll Basic Med Sci, Zhengzhou 450001, Henan, Peoples R China
[3] Zhengzhou Univ, Dept Pediat Surg, Affiliated Hosp 1, Zhengzhou 450052, Henan, Peoples R China