1. From the Department of Pediatrics, Faculty of Medicine, Umm Alqura University, Makkah, Saudi Arabia
2. From the Princess Noorah Oncology Center, KAMC- jeddah, Saudi Arabia
3. Correspondence: Dr. Wasil Jastaniah · Asst Professor and Consultant Pediatric Hematology/Oncology/BMT, Chairman, Department of Pediatrics, UQU, Makkah, Chairman, Princess Noorah Oncology Center, King Abdulaziz Medical City, Jeddah, P.O.BOX 9515, Jeddah 21423, Saudi Arabia · jastaniahwa@ngha.med.sa · Accepted: October 2010