1 Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany ; Department of Endocrinology and Diabetology, University Hospital Düsseldorf, Düsseldorf, Germany.
2 Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University, Düsseldorf, Germany ; Department of Endocrinology and Diabetology, University Hospital Düsseldorf, Düsseldorf, Germany ; German Center for Diabetes Research (DZD e.V.), Partner Düsseldorf, Germany.