[1] Duke Univ Hlth Syst, Dept Med, Div Nephrol, Med, Durham, NC USA
[2] Duke Sch Med, Durham, NC USA
[3] Duke Univ, Sch Med, Durham, NC USA
[4] Duke Univ Hlth Syst, Emergency Med, Durham, NC USA
[5] Duke Univ Hlth Syst, Dept Med, Div Geriatr, Durham, NC USA
[6] Duke Univ Hlth Syst, Dept Med, Durham, NC USA
[7] Duke Univ, Dept Med, Div Geriatr, Durham, NC USA
[8] Duke Univ Hlth Syst, Med, Dept Med, Durham, NC USA
[9] Duke Univ Hlth Syst, Family Med & Community Hlth, Durham, NC USA
[10] Duke Univ, Med Ctr, Dept Med, Div Nephrol, Box 3512, Durham, NC 27710 USA