1. Cardiovascular Diseases Research Center, Birjand University of Medical Sciences, Birjand, Iran
2. Medical Students Research Committee, Shahed University, Tehran, Iran
3. Department of Cardiology, Universitätsmedizin Schleswig-Holstein, Lubeck, Germany
4. Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran
5. Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran