[1] King Saud Univ, King Khalid Univ Hosp, Coll Med, Anesthesia & Pain Management Dept, Riyadh, Saudi Arabia
[2] Minia Univ, Fac Med, Al Minya, Egypt
[3] Cairo Univ, NCI, Cairo, Egypt
[4] Univ Nebraska, Med Ctr, Dept Phys Med & Rehabil, Coll Med, Omaha, NE USA
[5] NEMA Res Inc, Naples, FL USA
[6] NYU, Grossman Sch Med, Dept Anesthesia, Div Pain Med, New York, NY USA