[1] NCI, VIRAL EPIDEMIOL BRANCH, AIDS & CANC SECT, BETHESDA, MD 20892 USA
[2] RES TRIANGLE INST, ROCKVILLE, MD 20852 USA
[3] CORNELL UNIV, MED CTR, NEW YORK, NY 10021 USA
[4] CHRISTIANA HOSP, NEWARK, DE 19713 USA
[5] MT SINAI MED CTR, NEW YORK, NY 10029 USA
[6] CHILDRENS HOSP PHILADELPHIA, PHILADELPHIA, PA 19104 USA
[7] GEORGE WASHINGTON UNIV, MED CTR, WASHINGTON, DC 20037 USA
[8] UNIV N CAROLINA, CHAPEL HILL, NC 27514 USA
[9] UNIV ATHENS, LAIKON GEN HOSP, SCH MED, GR-11527 ATHENS, GREECE
[10] CARDELA FDN, CTR HEMOPHILIA, PHILADELPHIA, PA 19107 USA
[11] UNIV MUNICH, W-8000 MUNICH 2, GERMANY
[12] TULANE UNIV, SCH MED, NEW ORLEANS, LA 70112 USA
[13] UNIV PITTSBURGH, PITTSBURGH, PA 15219 USA
[14] UNIV VIENNA, A-1090 VIENNA, AUSTRIA
[15] CASE WESTERN RESERVE UNIV, CLEVELAND, OH 44106 USA
[16] PENN STATE UNIV, MILTON S HERSHEY MED CTR, SCH MED, HERSHEY, PA 17033 USA
[17] CROIX ROUGE FRANCAISE, HEMOPHILIA TREATMENT SERV, F-73230 ST ALBAN LEYSSE, FRANCE
[18] CHILDRENS HOSP, NATL MED CTR, WASHINGTON, DC 20010 USA
[19] ATLANTIC RES CORP, ROCKVILLE, MD USA