[1] IRWIN MEM BLOOD CTR,RES SERV,SAN FRANCISCO,CA 94118
[2] ESCOLA PAULISTA MED,SAO PAULO,BRAZIL
[3] FUNDACAO PROSANGUE HEMOCTR SAO PAULO,SAO PAULO,BRAZIL
[4] NEW YORK BLOOD CTR,NEW YORK,NY 10021
[5] UNIV SO CALIF,SCH MED,TRANSFUS SAFETY STUDY,LOS ANGELES,CA 90033
[6] UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143