[1] Mayo Clin, Dept Med, Clin Res Off, Dept Internal Med, Rochester, MN 55905 USA
[2] Mayo Clin, Div Primary Care Internal Med, Rochester, MN 55905 USA
[3] Mayo Clin, Div Gen Internal Med, Dept Internal Med, Rochester, MN 55905 USA
[4] Mayo Clin, Div Biomed Stat & Informat, Dept Hlth Sci Res, Rochester, MN 55905 USA
[5] Mayo Clin, Robert D & Patricia E Kern Ctr Sci Hlth Care Deli, Rochester, MN 55905 USA