1. King's College London; Section of Cancer Epidemiology and Population Health; London United Kingdom
2. Centre for Epidemiology, Mathematics and Statistics, Wolfson Institute of Preventive Medicine; Queen Mary University of London; London United Kingdom
3. Department of Public Health, Section for Epidemiology; Aarhus University; Aarhus Denmark
4. Danish Cancer Society Research Center; Copenhagen Denmark
5. Department of Surgical Sciences; Uppsala University; Uppsala Sweden