[1] UNIV WASHINGTON,SCH MED,DEPT MED,SEATTLE,WA 98195
[2] UNIV WASHINGTON,SCH MED,DEPT EPIDEMIOL,SEATTLE,WA 98195
[3] UNIV WASHINGTON,SCH MED,DEPT OBSTET & GYNECOL,SEATTLE,WA 98195
[4] UNIV WASHINGTON,SCH MED,DEPT PATHOL,SEATTLE,WA 98195
[5] NAIROBI CITY COMMISS,NAIROBI,KENYA
[6] UNIV NAIROBI,DEPT MED MICROBIOL,NAIROBI,KENYA
[7] UNIV MANITOBA,DEPT MED MICROBIOL,WINNIPEG R3T 2N2,MANITOBA,CANADA
[8] INST TROP MED,ANTWERP,BELGIUM