1. Department of Pain Medicine; The University of Texas MD Anderson Cancer Center; Houston TX
2. Department of Emergency Medicine; McGovern Medical School; The University of Texas Health Science Center at Houston; Houston TX
3. Memorial Hermann-Texas Medical Center; Houston TX
4. Lyndon B. Johnson General Hospital; Houston TX
5. Department of Emergency Medicine; Valley Baptist Medical Center; Brownsville TX
6. Department of Emergency Medicine Methodist Hospital; Houston TX
7. Conroe Regional Medical Center; Conroe TX