1. Department of Medicine, Clinical Epidemiology Unit, Karolinska Institutet, Stockholm, Sweden
2. Department of Statistics and Quantitative Methods, University of Milano-Bicocca, Milan, Italy
3. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
4. Clinical Effectiveness Research Group, Institute of Health and Society, University of Oslo, Oslo, Norway
5. Obesity Center, Academic Specialist Center, Stockholm Health Services, Stockholm, Sweden