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1Oslo Centre for Biostatistics and Epidemiology, Research Support Services, Oslo University Hospital, Oslo, Norway 2Department of Biostatistics, Medical School, Marmara University, İstanbul, Turkey 3Division of Epidemiology and Biostatistics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa 4Faculty of Chemistry, Biotechnology and Food Sciences, Norwegian University of Life Sciences, Ås, Norway 5Faculty of Medicine and Medical Center, Institute of Medical Biometry and Statistics, University of Freiburg, Freiburg, Germany 6Center for Medical Statistics, Informatics, and Intelligent Systems, Medical University of Vienna, Vienna, Austria 7Department of Biostatistics at Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland 8Oslo Centre for Biostatistics and Epidemiology, University of Oslo, Oslo, Norway 9Section of Biostatistics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark 10Centre for Statistical Science, Peking University, Beijing, China 11Institute for Health Care Delivery Science, Icahn School of Medicine at Mount Sinai, New York, New York, USA 12Division of Biostatistics, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden 13Centre for Biostatistics, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK 14Centre for Epidemiology Versus Arthritis, Centre for Musculoskeletal Research, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK 15Basel Academy for Quality and Research in Medicine, Basel, Switzerland 16Department of Environmental Sciences, University of Basel, Basel, Switzerland 17Laboratory for Interdisciplinary Statistical Analysis, Department of Applied Mathematics, University of Colorado Boulder, Boulder, Colorado, USA Correspondence Manuela Zucknick, Oslo Centre for Biostatistics and Epidemiology, University of Oslo, Oslo, Norway. Email: [email protected]