[1] Univ N Carolina, Sch Med, Dept Family Med, Chapel Hill, NC USA
[2] Univ Minnesota, Sch Med, Dept Family Med & Community Hlth, Minneapolis, MN 55414 USA
[3] Univ Penn, Dept Family Med & Community Hlth, Philadelphia, PA USA
[4] Univ Penn, Ctr Publ Hlth Initiat, Philadelphia, PA USA
[5] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA USA
[6] Mt Area Hlth Educ Ctr MAHEC, Family Med Residency Program, Asheville, NC USA
[7] Univ Penn, Perelman Sch Med, Philadelphia, PA USA
[8] NHGRI, NIH, Bethesda, MD USA
[9] Univ Minnesota, Sch Med, Dept Family Med, 717 Delaware St Southeast, Minneapolis, MN 55414 USA