1. Department of Physiology, School of Medical Sciences, University Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
2. Sleep and Alertness Clinic, University Health Network, Toronto, Ontario, Canada
3. Somnogen Inc, New York
4. Division of Clinical Pharmacology and Experimental Therapeutics, Department of Medicine, College for Physicians and Surgeons, Columbia University, New York
5. Department of Physiology, Faculty of Medicine, University of Buenos Aires, Buenos Aires, Argentina,