[1] Univ Rotterdam Hosp, Dept Ophthalmol, NL-3015 GD Rotterdam, Netherlands
[2] Netherlands Red Cross, Blood Transfus Serv, Cent Lab, Dept Immunohaematol, Amsterdam, Netherlands
[3] Netherlands Red Cross, Blood Transfus Serv, Cent Lab, Dept Blood Cell Chem, Amsterdam, Netherlands
[4] Univ Amsterdam, Clin & Expt Immunol Lab, NL-1012 WX Amsterdam, Netherlands
[5] Univ Amsterdam, Acad Med Ctr, Dept Haematol, NL-1105 AZ Amsterdam, Netherlands
[6] Univ Cambridge, Addenbrookes Hosp, Dept Transfus Med, Cambridge, England