1. a Division of Cancer Epidemiology and Prevention, Institute of Social and Preventive Medicine , University of Zurich , Zurich , Switzerland
2. b Department of Epidemiology , Johns Hopkins Bloomberg School of Public Health , Baltimore , Maryland , USA
3. d Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins , Baltimore , Maryland , USA
4. e James Buchanan Brady Urological Institute, Johns Hopkins Medical Institutions , Baltimore , Maryland , USA
5. c Institute of Epidemiology I, Helmholtz Zentrum München , Neuherberg , Germany