1. Cardiology Section, VA Medical Center, Albuquerque, New Mexico.
2. Cardiology Section, New Mexico Health Care System, Albuquerque, New Mexico.
3. College of Education-Nutrition/Dietetics, University of New Mexico, Albuquerque.
4. College of Medicine, University of Cincinnati, Cincinnati, Ohio.
5. Department of Anesthesia, Ochsner Clinic Foundation, New Orleans, Louisiana.
6. Department of Laboratories, Lovelace Medical Center, Albuquerque,New Mexico.
7. Department of Anesthesia & Critical Care, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts.
8. Altitude Research Center, University of Colorado, Aurora, Colorado.