1. Department of Dermatology; Baylor University Medical Center; Dallas TX USA
2. National Histocompatibility and Immunogenetics Service for Solid Organ Transplantation; Beaumont Hospital; Dublin Ireland
3. National Histocompatibility and Immunogenetics Reference Laboratory; Irish Blood Transfusion Service; Dublin Ireland
4. Department of Dermatology; St Vincent's University Hospital; Dublin Ireland
5. St John's Institute of Dermatology; Division of Genetics and Molecular Medicine; King's College; London UK
6. Division of Biomedical Statistics and Informatics; Mayo Clinic; Rochester MN USA