1. Department of Internal Medicine, Mountain View Hospital, Las Vegas, NV, USA
2. Department of Health Care Administration and Policy School of Community Health Sciences, University of Nevada Las Vegas, NV, USA
3. Department of Health Administration and Management, Soonchunhyang University, Asan, Chungcheongnam-do, South Korea
4. Department of Physical Medicine and Rehabilitation, Mountain View Hospital, Las Vegas, NV, USA
5. Department of Internal Medicine, Southern Nevada Veterans Affairs Health System, North Las Vegas, NV, USA
6. Department of Internal Medicine, University of Nevada Las Vegas, School of Medicine, NV, USA
7. Department of Thoracic and Cardiovascular Surgery, Korea University Medical Center, Ansan Hospital, Korea University College of Medicine, Ansan, South Korea