1. Department of Ophthalmology, VU University Medical Center, Amsterdam, the Netherlands
2. Institute for Research in Extramural Medicine, VU University Medical Center, Amsterdam, the Netherlands
3. Department of General Practice, VU University Medical Center, Amsterdam, the Netherlands
4. Department of Endocrinology, VU University Medical Center, Amsterdam, the Netherlands
5. Department of Internal Medicine, VU University Medical Center, Amsterdam, the Netherlands