[1] AMER RED CROSS, SE MICHIGAN REG,BLOOD SERV RES LAB,BOX 33351, 100 MACK AVE, DETROIT, MI 48232 USA
[2] UNIV FLORIDA, COLL MED, DEPT MED, GAINESVILLE, FL 32610 USA
[3] WASHINGTON UNIV, SCH MED, ST LOUIS, MO 63110 USA
[4] UNIV COPENHAGEN, CHEM LAB 4, DK-2100 COPENHAGEN, DENMARK