[1] UNIV COLOGNE,HAUTSKLIN,W-5000 COLOGNE 41,GERMANY
[2] STADT KRANKENANSTALTEN,INST TRANSFUS MED,COLOGNE,GERMANY
[3] SRK,ZENT LAB BLUTSPENDEDIENST,BERN,SWITZERLAND
[4] UNIV COLOGNE,INST VIROL,W-5000 COLOGNE 41,GERMANY
[5] BELG MIL KRANKENHAUS,MIKROBIOL ABT,COLOGNE,GERMANY
[6] UNIV COLOGNE,MED 2 KLIN & POLIKLIN,W-5000 COLOGNE 41,GERMANY
[7] UNIV COLOGNE,INST HYG,W-5000 COLOGNE 41,GERMANY
[8] UNIV COLOGNE,INST PATHOL,W-5000 COLOGNE 41,GERMANY