[1] Univ North Carolina, Gillings Sch Global Publ Hlth, Dept Epidemiol, Chapel Hill, NC 27599 USA
[2] Univ North Carolina, Lineberger Comprehens Canc Ctr, Chapel Hill, NC 27599 USA
[3] Univ North Carolina, Eshelman Sch Pharm, Div Pharmaceut Outcomes & Policy, Chapel Hill, NC 27516 USA
[4] Duke Canc Inst, Durham, NC 27701 USA
[5] Univ North Carolina, Gillings Sch Global Publ Hlth, Dept Hlth Policy & Management, Chapel Hill, NC 27516 USA