1. Division of Neurology, University Medical Centre Maribor, 2000 Maribor, Slovenia
2. Faculty of Medicine, University of Maribor, 2000 Maribor, Slovenia
3. Outpatient Diabetes Clinic, Community Health Centre Koper, 6000 Koper, Slovenia
4. Neuropathy Center, Neurology Clinic, Clinical Center of Serbia, 11000 Belgrade, Serbia
5. School of Medicine, University of Belgrade, 11000 Belgrade, Serbia
6. University Clinic Vuk Vrhovac, Clinical Hospital Merkur, 10000 Zagreb, Croatia
7. University Clinic of Endocrinology, Diabetes and Metabolic Disorders, 1000 Skopje, North Macedonia
8. Faculty of Medicine, Ss. Cyril and Methodius University in Skopje, 1000 Skopje, North Macedonia
9. Department of Neurology, Military Institute of Medicine—National Institute of Science, 04-052 Warsaw, Poland