[1] Natl Guard Hlth Affairs, Dept Ophthalmol, King Abdulaziz Med City, Riyadh 11426, Saudi Arabia
[2] King Abdullah Int Med Res Ctr KAIMRC, Riyadh 11426, Saudi Arabia
[3] King Saud Bin Abdulaziz Univ Hlth Sci, Riyadh 11426, Saudi Arabia
[4] Natl Guard Hlth Affairs, King Abdulaziz Med City, Div Adult Hematol, Riyadh 11426, Saudi Arabia
[5] Natl Guard Hlth Affairs, King Abdulaziz Med City, Div SCT, Riyadh 11426, Saudi Arabia