1. Kaiser Permanente Northern California, Oakland, and Blood Systems Research Institute and University of California, San Francisco, San Francisco, California (N.H.R.)
2. Blood Systems Research Institute and University of California, San Francisco, San Francisco, California (E.L.M.)
3. Kaiser Permanente Northern California, Oakland, California (D.G.M., C.L., P.K., V.X.L., G.J.E.)
4. Institute for Transfusion Medicine, Pittsburgh, Pennsylvania (D.J.T.)
5. Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey (J.L.C.)
6. University of British Columbia, Victoria, British Columbia, Canada (S.K.)