[1] Mayo Clin, Coll Med, Div Epidemiol, Dept Hlth Sci Res, Rochester, MN 55905 USA
[2] Mayo Clin, Coll Med, Dept Mol Pharmacol & Expt Therapeut, Rochester, MN USA
[3] Mayo Clin, Coll Med, Dept Hlth Sci Res, Div Biomed Stat & Informat, Rochester, MN USA
[4] Mayo Clin, Coll Med, Dept Internal Med, Div Gen Internal Med, Rochester, MN USA
[5] Mayo Clin, Coll Med, Dept Internal Med, Div Hematol, Rochester, MN USA