[1] Univ Hosp Cleveland, Ireland Canc Ctr, Cleveland, OH 44106 USA
[2] Univ Hosp, Primary Care Phys Practice, Berea, OH 44017 USA
[3] Univ Texas, Hlth Sci Ctr, Dept Family & Community Med, San Antonio, TX USA
[4] Case Western Reserve Univ, Sch Med, Dept Sociol, Cleveland, OH 44106 USA
[5] Case Western Reserve Univ, Sch Med, Dept Epidemiol & Biostat, Cleveland, OH 44106 USA
[6] Case Western Reserve Univ, Sch Med, Dept Family Med, Cleveland, OH 44106 USA