a1 Centre for Epidemiology and Biostatistics, University of Leeds, Leeds LS2 9JT, UK
a2 Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester LE2 7LX, UK
Footnotes
Members of the CARE Study Group: Leeds team: S. Boylan, J.E. Cade, V.A. Dolby, D.C. Greenwood, A.W.M. Hay, S.F.L. Kirk, S. Shires, N Simpson, J.D. Thomas, J. Walker, K.L.M. White, C.P. Wild. Leicester team: J. Charvill, K.C. Chipps, M. Cooke, S. Kassam, J.C. Konje, C. Patel, N. Potdar, N. Taub.