机构:
George Washington Univ, Med Ctr, Ctr Hlth Serv Res & Policy, Washington, DC 20006 USAGeorge Washington Univ, Med Ctr, Ctr Hlth Serv Res & Policy, Washington, DC 20006 USA
机构:
Duke Univ, Med Ctr, Dept Med,Geriatr Res Educ & Clin Ctr, Ctr Study Aging & Human Dev,Vet Affairs Med Ctr, Durham, NC 27710 USADuke Univ, Med Ctr, Dept Med,Geriatr Res Educ & Clin Ctr, Ctr Study Aging & Human Dev,Vet Affairs Med Ctr, Durham, NC 27710 USA