Autor: Yin Bun Cheung

David Machin: Division of Clincial Trials and Epidemiological Sciences, National Cancer Centre, Singapore; UK Children”s Cancer Study Group, University of Leicester, UK Institute of General Practice and Primary Care, School of Health and Related Sciences, University of Sheffield, UK Author of recently published Design of Medical Studies for Medical Research and editor of Textbook of Clinical Trials among other Wiley titles. Yin Bun Cheung: MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, UK, Division of Clinical Trials and Epidemiological Sciences, National Cancer Centre, Singapore. Mahesh Parmar: Cancer Trials Division, MRC Clincial Trials Unit, London, UK.