1. Department of Clinical Epidemiology, Leiden University Medical Center , 2333 ZA Leiden , The Netherlands
2. Department of Biomedical Data Sciences, Leiden University Medical Center , 2333 ZA Leiden , The Netherlands
3. Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital , 8200 Aarhus , Denmark
4. Department of Endocrinology, Leiden University Medical Center , 2333 ZA Leiden , The Netherlands