1. University of Bristol, Bristol, United Kingdom (L.M.O.)
2. University of Cambridge and National Institute for Health Research Blood and Transplant Research Unit in Donor Health and Genomics, Cambridge, United Kingdom (A.R.)
3. University of Cambridge, Cambridge, United Kingdom (C.O., J.E.)
4. University of Cambridge, Cambridge, United Kingdom, and Medical University of Innsbruck, Innsbruck, Austria (P.W.)
5. University of Cambridge, Cambridge, United Kingdom, and Australian National University, Canberra, Australia (E.P.)
6. National Institute for Health Research Blood and Transplant Research Unit in Organ Donation and Transplantation and University of Cambridge, Cambridge, United Kingdom (P.T., M.N.)
7. Karolinska University Hospital, Stockholm, Sweden (J.W.)
8. National Health Service Blood and Transplant, Bristol, United Kingdom (D.C.)
9. University of Cambridge, National Institute for Health Research Blood and Transplant Research Unit in Donor Health and Genomics, and National Health Service Blood and Transplant, Cambridge, United Kingdom (E.D.)