[1] Beni Suef Univ, Bani Suwayf, Egypt
[2] Cairo Univ, Cairo, Egypt
[3] Univ Jordan, Amman, Jordan
[4] Suez Canal Univ, Ismailia, Egypt
[5] Univ Khartoum, Khartoum, Sudan
[6] Cadi Ayyad Univ, Cadi, Morocco
[7] Sidi Mohamed Ben Abdellah Univ, Fes, Morocco
[8] Alexandria Univ, Alexandria, Egypt
[9] Univ Maryland, Sch Med, Baltimore, MD USA
[10] Univ Maryland, Sch Med, 110 South Paca St, Baltimore, MD 21201 USA