1. Medical Education Unit, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
2. Institute of Experimental & Clinical Pharmacology, University Hospital Schleswig-Holstein, Kiel, Germany
3. Department of Pharmacology & Toxicology, Faculty of Medicine, American University of Beirut, PO Box 11-0236, Riad El Solh, Beirut 1107 2020, Lebanon.