[1] Johns Hopkins Univ, Wilmer Eye Inst, Sch Med, Baltimore, MD 21287 USA
[2] Tongji Univ, Sch Med, Dept Ophthalmol, Shanghai Hosp 10, Shanghai 200092, Peoples R China
[3] Tongji Univ, Sch Med, Tongji Eye Inst, Shanghai 200092, Peoples R China
[4] Univ Eastern Finland, Dept Ophthalmol, Inst Clin Med, Kuopio, Finland
[5] Univ Eastern Finland, Kuopio Univ Hosp, Kuopio, Finland