[1] Fayoum Univ, Fac Med, Dept Clin Pathol Hematol, POB 63514, Faiyum, Egypt
[2] Princess Nourah Bint Abdulrahman Univ, Coll Med, Riyadh, Saudi Arabia
[3] Alfaisal Univ, Coll Med, Riyadh, Saudi Arabia
[4] King Faisal Specialist Hosp & Res Ctr, Dept Pathol, Riyadh, Saudi Arabia