[1] Brown Univ, Warren Alpert Med Sch, Dept Med, Providence, RI 02903 USA
[2] Brown Univ, Publ Hlth & Res Support Lib, Providence, RI USA
[3] Rhode Isl Hosp, Lifespan Biostat Epidemiol & Res Design, Providence, RI USA
[4] Temple Univ, Dept Med, Philadelphia, PA USA