[1] Univ Dusseldorf, Inst Klin Diabetol, Deutsch Diabet Zentrum, Leibniz Zentrum Diabet Forsch, D-4000 Dusseldorf, Germany
[2] Univ Klinikum Dusseldorf, Klin Stoffwechselkrankheiten, Dusseldorf, Germany
[3] Carl Gustav Carus Univ, Med Klin & Poliklin 3, Univ Klinikum Dresden, Dresden, Germany
[4] Tech Univ Dresden, Paul Langerhans Inst Diabet Forsch, Dresden, Germany
[5] Ctr Regenerat Therapies, Dresden, Germany