1. Department of Internal Medicine, Oklahoma State University Medical Center, 717 S. Houston Ave., Ste 304, Tulsa, OK 74127, USA
2. Department of Institutional Research, Oklahoma State University Center for Health Sciences, 1111 W 17th St., Tulsa, OK 74107, USA
3. Department of Cardiovascular Medicine, Oklahoma State University Medical Center, 744 West 9th St., Tulsa, OK 74127, USA