Reconstruction of the historic time course of blood‐borne virus contamination of clotting factor concentrates, 1974–1992 by McClure, CP, Kean, K, Reid, K, Mayne, R, Fu, MX, Rajendra, P, Gates, S, Breuer, J, Harvala, H, Golubchik, T, Tarr, AW, Irving, WL, Makris, M, Simmonds, P