[1] Univ N Carolina, Dept Hlth Behav & Hlth Educ, Gillings Sch Global Publ Hlth, Chapel Hill, NC 27599 USA
[2] Washington Univ, Natl Program Off, Diabet Initiat Robert Wood Johnson Fdn, Sch Med, St Louis, MO 63130 USA
[3] Univ N Carolina, UNC Diabet Ctr, Chapel Hill, NC 27599 USA
[4] Univ N Carolina, Dept Family Med, Sch Med, Chapel Hill, NC 27599 USA