[1] Mayo Clin & Mayo Fdn, Dept Family Med, Rochester, MN 55905 USA
[2] Texas Tech Univ, Hlth Sci Ctr, Dept Family Med, Lubbock, TX 79430 USA
[3] Dept Family Med, Mayo Clin, Rochester, MN USA
[4] Dept Psychiat & Psychol, Mayo Clin, Rochester, MN USA
[5] Dept Family Med, Mayo Clin, Kasson Clin, Rochester, MN USA