1. Department of Nephrology, University of Thessaly School of Medicine, Larissa, Greece;
2. Department of Biomathematics, University of Thessaly School of Medicine, Larissa, Greece;
3. Department of Ophthalmology, University of Thessaly School of Medicine, Larissa, Greece;
4. Department of Neurology, University of Thessaly School of Medicine, Larissa, Greece;
5. Department of Nephrology, Hypertension, Diabetes and Endocrinology, School of Medicine, University of Magdeburg, Magdeburg, Germany;
6. Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, Spain;
7. The Institute for Clinical Research and Health Policy Studies, Tufts Medical Center, Tufts University School of Medicine, Boston, MA, USA