[1] Capital Univ Med Sci, Beijing Tongren Hosp, Beijing Tongren Eye Ctr, Dept Ophthalmol, Beijing 100730, Peoples R China
[2] Beijing Best Vis Eye Clin, Beijing, Peoples R China
[3] Capital Univ Med Sci, Beijing Chaoyang Hosp, Dept Ophthalmol, Beijing 100730, Peoples R China
[4] Hebei Handan Eye Hosp, Handan City, Hebei Province, Peoples R China
[5] Hebei Cixian Hosp, Dept Ophthalmol, Ci Cty, Hebei Province, Peoples R China
[6] Peking Univ, Hlth Sci Ctr, Sch Publ Hlth, Beijing 100871, Peoples R China