[1] Univ Massachusetts, Med Sch, Dept Med, 55 Lake Ave North, Worcester, MA 01655 USA
[2] Harvard Sch Publ Hlth, Dept Social & Behav Sci, Boston, MA USA
[3] Univ Massachusetts, Dept Family Med & Community Hlth, Med Sch, Worcester, MA 01655 USA
[4] Univ Iowa, Carver Coll Med, OCRME, 1204 MEB, Iowa City, IA 52242 USA
[5] Creighton Univ, Dept Family Med, Sch Med, 2412 Cuming St, Omaha, NE 68131 USA
[6] Univ Penn, Perelmcm Sch Med, 3451 Walnut St, Philadelphia, PA 19104 USA
[7] Medstar Georgetown Univ Hosp, Dept Internal Med, 3800 Reservoir Rd NW,PHC 5, Washington, DC 20007 USA
[8] Univ Louisville, Sch Med, 500 S Preston St, Louisville, KY 40202 USA
[9] Univ Alabama Birmingham, 1720 2nd Ave South,Webb 646, Birmingham, AL 35294 USA
[10] Oregon Hlth & Sci Univ, 3181 SW Sam Jackson Pk Rd,CR110, Portland, OR 97239 USA
[11] Brown Univ, Warren Alpert Med Sch, 222 Richmond St, Providence, RI 02903 USA
[12] Virginia Commonwealth Univ, Dept Psychiat, Med Ctr, 1200 East Broad St, Richmond, VA 23298 USA