1. Department of Psychiatry, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
2. Government Hospitals, Manama, Bahrain
3. Faculty of Medicine of Tunis, Tunis, Tunisia, Razi Hospital, rue des orangers, Manouba, Tunisia
4. Saveetha Medical College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India
5. Division of Research and Development, Lovely Professional University, Phagwara, Punjab, India
6. Department of Medicine, University Sleep Disorders Center and Pulmonary Service, King Saud University, Riyadh, Saudi Arabia
7. Department of Psychiatry & Behavioral Sciences, University of Washington, Seattle, WA, USA