1. a University of Tulsa , Tulsa, OK, USA
2. b Private Practice , Dallas, TX, USA
3. c University of Arkansas Medical Center , Little Rock, AR, USA
4. d Hillcrest Medical Center , Tulsa, OK, USA
5. e Laureate Hospital , Tulsa, OK, USA
6. f University of Texas at Tyler , Tyler, TX, USA
7. g Ohio State University , Columbus, OH, USA