1. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands.
2. Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands.
3. Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands.
4. Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, the Netherlands.
5. Department of Endocrinology, Radboud University Medical Center, Nijmegen, the Netherlands.
6. Department of Internal Medicine, VU Medical Center, Amsterdam, the Netherlands.