[1] Univ N Carolina, UNC Lineberger Comprehens Canc Ctr, Div Hematol Oncol, Chapel Hill, NC 27515 USA
[2] Univ N Carolina, Cecil G Sheps Ctr Hlth Serv Res, Chapel Hill, NC 27515 USA
[3] Univ N Carolina, UNC Dept Biostat, Chapel Hill, NC 27515 USA
[4] Univ N Carolina, UNC Palliat Care Program, UNC Sch Med, Chapel Hill, NC 27515 USA
[5] Univ N Carolina, Dept Psychiat, UNC Sch Med, Chapel Hill, NC 27515 USA