[1] Univ Rochester, Dept Publ Hlth Sci, Rochester, NY 14642 USA
[2] Canandaigua VA Med Ctr, Geriatr & Extended Care Data Anal Ctr, Canandaigua, NY USA
[3] Cincinnati Vet Affairs Med Ctr, Cincinnati, OH USA
[4] Brown Univ, Sch Publ Hlth, Ctr Gerontol & Healthcare Res, Providence, RI 02912 USA
[5] Corporal Michael Crescenz Vet Affairs Med Ctr, Geriatr & Extended Care Data Anal Ctr, Philadelphia, PA USA
[6] Univ Penn, Sch Med, Div Geriatr, Philadelphia, PA 19104 USA
[7] Vet Affairs Palo Alto Hlth Care Syst, Hlth Econ Resource Ctr, Geriatr & Extended Care Data Anal Ctr, Menlo Pk, CA USA
[8] Stanford Univ, Dept Pediat, Sch Med, Div Neonatal & Dev Med, Stanford, CA 94305 USA