[1] Brown Univ, Sch Publ Hlth, Providence, RI 02903 USA
[2] Brown Univ, Warren Alpert Med Sch, Providence, RI 02903 USA
[3] Brown Univ, Sch Publ Hlth, Dept Hlth Serv Policy & Practice, 55 Claverick St, Providence, RI 02903 USA
[4] Brown Univ, Sch Publ Hlth, Ctr Gerontol & Healthcare Res, Providence, RI 02903 USA
[5] Brown Univ, Warren Alpert Med Sch, Dept Emergency Med, Providence, RI 02903 USA