[1] WAKE FOREST UNIV, BOWMAN GRAY SCH MED, WINSTON SALEM, NC 27103 USA
[2] PK NICOLLET MED FDN, MINNEAPOLIS, MN USA
[3] YALE UNIV, SCH MED, NEW HAVEN, CT 06510 USA
[4] UNIV ARKANSAS MED SCI HOSP, LITTLE ROCK, AR 72205 USA
[5] AGCY HLTH CARE POLICY & RES, CTR GEN HLTH SERV RES, ROCKVILLE, MD USA
[6] UNIV CALIF SAN FRANCISCO, SAN FRANCISCO, CA 94143 USA
[7] UNIV WASHINGTON, SCH PUBL HLTH & COMMUNITY MED, SEATTLE, WA 98195 USA
[8] BURROUGHS WELLCOME CO, RES TRIANGLE PK, NC 27709 USA
[9] WASHINGTON UNIV, SCH MED, ST LOUIS, MO 63110 USA
[10] PFIZER INC, PFIZER CENT RES, GROTON, CT 06340 USA
[11] DARTMOUTH COLL, HITCHCOCK MED CTR, DARTMOUTH MED SCH, HANOVER, NH 03756 USA
[12] NEW ENGLAND MED CTR INC, INST HLTH, BOSTON, MA USA
[13] AGCY HLTH CARE POLICY & RES, DIV PRIMARY CARE, ROCKVILLE, MD USA