1. From the Department of Hematology (Y.M.B., M.H.J.v.O.) and the Department of Cardiothoracic Surgery (L.E.), Academic Medical Center, Amsterdam, The Netherlands; and the Department of Immnunohematology and Blood Transfusion and Sanquin Bloodbank Southwest (L.M.G.v.d.W, A.B.), the Department of Cardiothoracic Surgery (M.I.M.V.), and the Department of Medical Statistics (R.B.), Leiden University Medical Center, Leiden, The Netherlands.