R Peto ; MC Pike ; P Armitage ; NE Breslow ; DR Cox ; SV Howard ; N Mantel ; K McPherson ; J Peto ; PG Smith ; (1976) Design and analysis of randomized clinical trials requiring prolonged observation of each patient. I. Introduction and design. British journal of cancer, 34 (6). pp. 585-612. ISSN 0007-0920 DOI: 10.1038/bjc.1976.220 PG Smith ; MC Pike ; MM Till ; RM Hardisty ; (1976) Epidemiology of childhood leukaemia in greater london: A search for evidence of transmission assuming a possibly long latent period. British journal of cancer, 33 (1). pp. 1-8. ISSN 0007-0920 DOI: 10.1038/bjc.1976.1