[1] Department of Pediatrics,
[2] Jordan University of Science & Technology,undefined
[3] Faculty of Medicine,undefined
[4] P.O. Box 30309,undefined
[5] Irbid,undefined
[6] Jordan,undefined
[7] e-mail: daoud@just.edu.jo,undefined
[8] Tel.: +962-2-7101093,undefined
[9] Fax: +962-2-295123,undefined
[10] Department of Community Medicine,undefined
[11] Jordan University of Science and Technology,undefined
[12] Jordan,undefined
[13] The Neonatal Unit of Princess Badia Teaching Hospital,undefined
[14] Irbid,undefined
[15] Jordan,undefined
[16] P.O. Box 2233,undefined
[17] Department of Otolaryngology,undefined
[18] Jordan University of Science and Technology,undefined
[19] Jordan,undefined