1 Institute for Clinical Diabetology, German Diabetes Center (DDZ) at Heinrich Heine University; Leibniz Center for Diabetes Research, Düsseldorf, Germany.
2 Department of Internal Medicine, Israelite Hospital, Hamburg, Germany.
3 Department of Pediatric and Adolescent Medicine, University Hospital Bochum, Ruhr University Bochum, Bochum, Germany.
4 Neuro-Urology, Swiss Paraplegic Center Nottwil, Nottwil, Switzerland.