1. Department of Clinical Epidemiology, Leiden University Medical Center , 2300RC Leiden , The Netherlands
2. Department of Clinical Epidemiology, Aarhus University, Aarhus University Hospital , 8200 Aarhus , Denmark
3. Department of Endocrinology, Leiden University Medical Center , 2300RC Leiden , The Netherlands
4. Department of Clinical Biochemistry, Aarhus University Hospital , 8200 Aarhus , Denmark
5. Department of Biomedical Data Sciences, Leiden University Medical Center , 2300RC Leiden , The Netherlands