1. Centre of Public Health Sciences, Faculty of MedicineUniversity of Iceland Reykjavík Iceland
2. Clinical Epidemiology and Biostatistics, School of Medical SciencesÖrebro University Örebro Sweden
3. Department of Medical Epidemiology and BiostatisticsKarolinska Institutet Stockholm Sweden
4. Department of Biochemistry and Molecular Biology, BioMedical Center, Faculty of MedicineUniversity of Iceland Reykjavik Iceland
5. Cancer Research Laboratory, BioMedical Center, Faculty of MedicineUniversity of Iceland Reykjavik Iceland
6. Medicines Policy Research Unit, Centre for Big Data Research in HealthUniversity of New South Wales Sydney Australia