[1] Univ N Carolina, Ctr Funct GI & Motil Disorders, Chapel Hill, NC 27599 USA
[2] Tohoku Univ, Grad Sch Med, Dept Behav Med, Sendai, Miyagi 980, Japan
[3] Columbia Univ, Dept Psychiat, New York, NY USA
[4] Univ Washington, Sch Social Work, Seattle, WA 98195 USA
[5] Mayo Clin Scottsdale, Scottsdale, AZ USA
[6] Univ Arkansas, Div Gastroenterol, Little Rock, AR 72204 USA