[1] Minnesota Dept Hlth, Canc Control Sect, Minneapolis, MN 55440 USA
[2] Univ Minnesota, Inst Hlth Serv Res, Minneapolis, MN USA
[3] Univ Minnesota, Dept Med, Minneapolis, MN 55455 USA
[4] Univ Minnesota, Hennepin Cty Med Ctr, Dept Med, Minneapolis, MN 55415 USA
[5] Univ Minnesota, Hennepin Cty Med Ctr, Div Epidemiol, Minneapolis, MN 55415 USA