1. Medical School, Lebanese American University Medical Center, Lebanese American University, P.O. Box 13-5053, Chouran Beirut: 1102 2801, Lebanon
2. Department of Orthopedic Surgery and Traumatology, Saint Georges University Medical Center, Balamand University, P.O.Box 166378, Achrafieh, Beirut 1100 2807, Lebanon
3. Faculty of Medicine, University Saint Joseph, P.O. Box 17-5208, Mar Mikhael, Beirut, Lebanon