A historical survey of key epidemiological studies of ionizing radiation exposure by Little, MP, Bazyka, D, Gonzalez, ABD, Brenner, AV, Chumak, VV, Cullings, H, Daniels, RD, French, B, Grant, E, Hamada, N, Hauptmann, M, Kendall, GM, Laurier, D, Lee, C, Lee, WJ, Linet, MS, Mabuchi, K, Morton, LM, Muirhead, CR, Preston, DL, Rajaraman, P, Richardson, DB, Sakata, R, Samet, JM, Simon, SL, Sugiyama, H, Wakeford, R, Zablotska, LB