The authors reply

Affiliations

• ¹ Oslo Center for Biostatistics and Epidemiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.
• ² Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, The Arctic University of Norway, Tromsø, Norway.
• ³ Department of Research, Cancer Registry of Norway, Oslo, Norway.
• ⁴ Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
• ⁵ Genetic Epidemiology Group, Folkhälsan Research Center, Helsinki, Finland.
• ⁶ Cancer and Population Studies Group, QIMR Berghofer Medical Research Institute, Brisbane, Australia.
• ⁷ CRUK Manchester Institute, University of Manchester, Manchester, United Kingdom.