[1] Alexandria Univ, Fac Med, Alexandria, Egypt
[2] Yale Univ, Sect Pediat Emergency Med, Dept Pediat, Sch Med, New Haven, CT USA
[3] Univ Thessaly, Dept Publ Hlth & Maritime Transport, Volos, Greece
[4] Civil Hosp Karachi, Dr Ruth K M Pfau, Karachi, Pakistan
[5] Allama Iqbal Med Coll, Lahore, Pakistan
[6] Drexel Univ, St Christophers Hosp Children, Pediat Emergency Med Fellowship, Coll Med, Philadelphia, PA 19104 USA
[7] Althawara Modern Gen Hosp, Dept Emergency Med, Sanaa, Yemen
[8] St Christophers Hosp Children, Pediat Emergency Dept, Philadelphia, PA 19134 USA