[1] Stanford Univ, Dept Pediat, Sect Pediat Gastroenterol Hepatol & Nutr, Sch Med, Palo Alto, CA USA
[2] Yale Sch Med, Dept Psychiat, New Haven, CT 06510 USA
[3] Yale Sch Med, Yale Stress Ctr, New Haven, CT 06510 USA
[4] Yale Sch Med, Dept Med, Sect Digest Dis, New Haven, CT 06510 USA
[5] Yale Univ, Yale Ctr Analyt Sci, Sch Publ Hlth, Dept Biostat, New Haven, CT USA
[6] Yale Sch Med, Dept Med, Sect Rheumatol Allergy & Immunol, New Haven, CT 06510 USA