[1] So Illinois Univ, Decatur Family Practice Residency Program, Sch Med, Springfield, IL USA
[2] So Illinois Univ, Sch Med, Dept RRC, Springfield, IL USA
[3] So Illinois Univ, Sch Med, Div Stat & Res Consultat, Springfield, IL USA
[4] So Illinois Univ, Sch Med, Dept Family & Community Med, Springfield, IL USA
[5] So Illinois Univ, Sch Med, Family Practice Residency Program, Springfield, IL USA