1. Division of Pediatric Hematology & Oncology, Children's Center for Cancer and Blood Diseases, Rafik Hariri University Hospital, Beirut, Lebanon Nini Hospital, Tripoli, Lebanon Balamand University, Balamand, Lebanon
2. Department of Internal Medicine, Hematology-Oncology Division, American University of Beirut Medical Center, Beirut, Lebanon
3. Divisions of Pediatric Cardiology and Radiology, Children's Hospital Los Angeles and Keck School of Medicine, University of Southern California, Los Angeles