[1] Mayo Clin, Div Community Internal Med, Dept Med, Rochester, MN 55905 USA
[2] Mayo Clin, Mayo Clin Program Phys Well Being, Rochester, MN 55905 USA
[3] Mayo Clin, Div Gen Internal Med, Dept Med, Rochester, MN 55905 USA
[4] Mayo Clin, Div Gastroenterol, Dept Med, Rochester, MN 55905 USA
[5] Mayo Clin, Dept Hlth Sci Res, Rochester, MN 55905 USA
[6] Stanford Sch Med, Dept Med, Stanford, CA 94305 USA