[1] Al Faisal Univ, Coll Med, POB 50927,Takhasusi Rd, Riyadh 11533, Saudi Arabia
[2] King Khalid Univ Hosp, Riyadh, Saudi Arabia
[3] King Saud Univ, Coll Med, Dept Physiol, Coagulat Res Lab, Riyadh, Saudi Arabia
[4] King Saud Univ, King Khalid Univ Hosp, Riyadh, Saudi Arabia