[1] VET AFFAIRS MED CTR,DEPT MED,HOUSTON,TX 77030
[2] VET AFFAIRS MED CTR,DEPT MICROBIOL & IMMUNOL,HOUSTON,TX 77030
[3] VET AFFAIRS MED CTR,DEPT MOL VIROL,HOUSTON,TX 77030
[4] BAYLOR COLL MED,HOUSTON,TX 77030
[5] UNIV NACL COLOMBIA,BOGOTA,COLOMBIA
[6] KOREA UNIV,COLL MED,GURO HOSP,SEOUL 136701,SOUTH KOREA
[7] DUKE UNIV,MED CTR,DEPT PATHOL,DURHAM,NC 27710