[1] Univ Vermont, Larner Coll Med, Dept Med, 89 Beaumont Ave,Given Courtyard South S467, Burlington, VT 05405 USA
[2] Univ Virginia, Dept Publ Hlth Sci, 345 Crispell Dr,POB 801379, Charlottesville, VA 22908 USA
[3] Arizona State Univ, Coll Hlth Solut, 500 N 3rd St, Phoenix, AZ 85004 USA
[4] Univ Massachusetts, Med Sch, Ctr Integrated Primary Care, Dept Family Med & Community Hlth, 55 Lake Ave, North Worcester, MA 01655 USA
[5] Univ Colorado, Dept Family Med, Denver, CO 80202 USA