1. College of Pharmacy, Qatar University, P.O. Box 2713, Doha, Qatar
2. Department of Pharmacology and Toxicology, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
3. Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, P.O. Box 2713, Doha, Qatar
4. Department of Anatomy, Cell Biology and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
5. School of Medicine, University of Texas Health Sciences Center at San Antonio, San Antonio, TX, USA