1. Medical Physiology,
2. Department of Internal Medicine,
3. R & E, Scott & White Hospital, The Texas A&M University System Health Sciences Center, College of Medicine, and
4. Division of Gastroenterology, Tohoku University School of Medicine, 1 – 1 Seiryo, Aobaku, Sendai, Japan 980 – 8574;
5. Division of Gastroenterology, University of Rome, “La Sapienza,” Rome 00185; and the
6. Department of Gastroenterology, University of Ancona, Ancona 60100;
7. Department of Public Health, University of Rome Tor Vergata, Rome, Italy 00185
8. Central Texas Veterans Health Care System, Temple, Texas 76504;