1. Unit of BiostatisticsKarolinska Institutet Stockholm Sweden
2. Department of Statistics and Quantitative MethodsUniversity of Milano‐Bicocca Milan Italy
3. Department of Medical Epidemiology and BiostatisticsKarolinska Institutet Stockholm Sweden
4. Department of MedicineKarolinska University Hospital Stockholm Sweden
5. Department of Public Health SciencesKarolinska Institutet Stockholm Sweden
6. Department of Infectious DiseasesKarolinska University Hospital Stockholm Sweden