1. Massachusetts General Hospital; Boston Massachusetts
2. Filton Blood Centre; Bristol UK
3. John Radcliffe Hospital; National Blood Service; Oxford UK
4. University of Washington; Seattle Washington
5. New Zealand Blood Service; Auckland New Zealand. Fletcher Allen Health Care; Burlington Vermont. Hema Quebec; Ste-Foy Quebec Canada. Beth Israel Deaconess Medical Center; Boston Massachusetts. Hospital Clinic Provincial; Barcelona Spain. Hoxworth Blood Center; Cincinnati Ohio. Sírio Libanês Hospital; São Paulo Brazil. Dartmouth-Hitchcock Medical Center; Lebanon NH