1. Grifols Immunohematology Center; San Marcos Texas
2. Division of Human Genetics; Jichi Medical University; Shimotsuke Japan
3. Immunohaematology Reference Laboratory; South African National Blood Services; Weltevreden Park South Africa
4. IWK Health Centre; Dalhousie University; Halifax Nova Scotia Canada
5. National Molecular Laboratory; American Red Cross Biomedical Services; Philadelphia Pennsylvania