[1] Ocular Surface Ctr, Miami, FL 33173 USA
[2] Res Inst Ophthalmol, Cairo, Egypt
[3] Sun Yat Sen Univ, Zhongshan Ophthalm Ctr, State Key Lab Ophthalmol, Guangzhou 510275, Guangdong, Peoples R China
[4] Guangzhou Med Coll, Affiliated Hosp 1, Guangzhou, Guangdong, Peoples R China