1. School of Medicine, University of New Mexico, Albuquerque, NM 87131, USA
2. Division of Gastroenterology and Hepatology, University of New Mexico, Albuquerque, NM 87131, USA
3. Department of Emergency Medicine, University of New Mexico, Albuquerque, NM 87131, USA
4. Medicine Service, New Mexico VA Health Care System, Albuquerque, NM 87108, USA