1. Cardiology Department, Ibrahim Bin Hamad Obaidullah Hospital, Ras Al Khaimah, United Arab Emirates
2. Internal Medicine Department, Texas Tech University Health Science Center, Lubbock, Texas, United States of America
3. Psychiatry Department, Upstate Medical University, New York, United States of America
4. Department of Psychiatry and Psychotherapy III, University of Ulm, Ulm, Germany