[1] Natl Inst Biol Stand & Controls, Div Haematol, Potters Bar EN6 3QG, Herts, England
[2] Univ Cambridge, Dept Haematol, Cambridge, England
[3] Natl Blood Serv Cambridge, Cambridge, England
[4] INTS, Platelet Unit, Paris, France
[5] Blood Res Inst, Milwaukee, WI USA
[6] Blood Ctr SE Wisconsin Inc, Milwaukee, WI 53233 USA
[7] Finnish Red Cross Blood Transfus Serv, SF-00310 Helsinki, Finland
[8] CLB, Sanquin Res, Amsterdam, Netherlands
[9] Saitama Red Cross Blood Ctr, Hidaka, Saitama, Japan
[10] McMaster Univ, Med Ctr, Hamilton, ON, Canada
[11] Univ Rostock, Dept Transfus Med, Rostock, Germany
[12] Univ Giessen, Inst Clin Immunol & Transfus Med, D-6300 Giessen, Germany