[1] Cairo Univ, Fac Med, Crit Care & Pain Management Dept, Cairo, Egypt
[2] Theodor Bilharz Res Inst, Surg ICU & Pain Management Dept, Giza, Egypt
[3] Kasr Al Ainy Hosp, Surg ICU & Pain Management Dept, Cairo, Egypt
[4] Cairo Univ, Fac Med, Anesthesiol Surg Intens Care & Pain Med Dept, Cairo, Egypt
[5] Cairo Univ, Fac Med, Anesthesia Crit Care & Pain Management, Cairo 11562, Egypt