1. Lebanese Atomic Energy Commission, National Council for Scientific Research, P.O. Box 11-8281, Riad El Solh, Beirut, Lebanon
2. Faculty of Sciences, Saint-Joseph University, P.O.Box 11-514, Riad El Solh, Beirut, Lebanon
3. Paris-Sud University Hospitals, Radiology and Nuclear Medicine Department, Kremlin-Bicêtre Hospital, Le Kremlin-Bicêtre, France
4. Belgium Nuclear Research Center (SCK-CEN), Boeretang 200, Mol, Belgium