1. Biomedical Research Institute of Lleida, University of Lleida, Rovira Roure 80, 25198 Lleida, Spain
2. Biostatistics & Epidemiology Unit, Biomedical Research Institute of Lleida, University of Lleida, Rovira Roure 80, 25198 Lleida, Spain
3. Department of Endocrinology & Nutrition, University Hospital Arnau de Vilanova, Rovira Roure 80, 25198 Lleida, Spain
4. Department of Laboratory Medicine, University Hospital Arnau de Vilanova, Rovira Roure 80, 25198 Lleida, Spain
5. Department of Ophthalmology, University Hospital Arnau de Vilanova, Rovira Roure 80, 25198 Lleida, Spain
6. Department of Endocrinology & Nutrition, Health Sciences Research Institute and University Hospital Germans Trias i Pujol, Carretera Canyet S/N, 08916 Badalona, Spain