1. Department of Biostatistics, Oslo Centre for Biostatistics and Epidemiology, University of Oslo, Sognsvannsveien 9, Domus Medica, 0372 Oslo, Norway
2. Department of Economics, Management and Statistics, University of Milano-Bicocca, Piazza dell’Ateneo Nuovo 1, 20126 Milano, Italy
3. Biomedical Data Sciences, Leiden University Medical Center, Einthovenweg 20, 2333 ZC Leiden, The Netherlands