[1] King Saud Univ, Coll Med, Dept Ophthalmol, Riyadh 11411, Saudi Arabia
[2] Padova Univ Hosp, Dept Ophthalmol, I-35128 Padua, Italy
[3] Georgia Hlth Sci Univ, Med Coll Georgia, Augusta, GA 30912 USA
[4] Georgia Hlth Sci Univ, Coll Grad Studies, Augusta, GA 30912 USA