Mayo Clinic, Rochester, MN, USA. Alliance Statistics and Data Center, Mayo Clinic, Rochester, MN, USA. Heartland Cancer Research CCOP, Missouri Baptist Medical Center, Saint Louis, MO, USA. Sanford NCI Community Oncology Research Program, Sioux Falls, SD, USA. School of Nursing, University of Michigan, 400 N. Ingalls, Suite 2153, Ann Arbor, MI, 48109, USA. debbartn@med.umich.edu.