1 Department of Diabetology and Angiology, Marienkrankenhaus gGmbH, Soest, Germany.
2 University Diabetes Center and Interdisciplinary Diabetic Foot Center of Central Hessen, University Hospital Giessen and Marburg GmbH, Location: Giessen and GZW Diabetes Clinic Bad Nauheim, Germany.
3 Department of Endocrinology, Diabetology and Geriatrics, Klinikum Stuttgart, Location: Bad Cannstatt, Germany.
4 Practice for Diabetology and Nephrology, KfH Kidney Center, Bernkastel-Kues, Germany.
5 Dortmund, Germany.
6 Diabetes Center at Sophie-Charlotte-Platz, Berlin, Germany.
7 Upper Rhine Vascular Center, Department of Vascular Surgery, Diakonissen-Stiftungs-Hospital, Speyer, Germany.