[1] SEATTLE PUBL HLTH HOSP, DEPT MED, DIV HLTH SERV RES, SEATTLE, WA USA
[2] UNIV WASHINGTON, SCH PUBL HLTH & COMMUNITY MED, DEPT HLTH SERV, SEATTLE, WA 98195 USA
[3] UNIV WASHINGTON, SCH PUBL HLTH & COMMUNITY MED, DEPT BIOSTAT, SEATTLE, WA 98195 USA
[4] UNIV WASHINGTON, SCH MED, DEPT MED, SEATTLE, WA 98195 USA
[5] UNIFORMED SERV UNIV HLTH SCI, SCH MED, OPERAT & EMERGENCY MED SECT, BETHESDA, MD 20014 USA
[6] BROOKE ARMY MED CTR, SAN ANTONIO, TX USA