[1] Tech Univ Dresden, DFG Ctr Regenerat Therapies Dresden, Carl Gustav Carus Fac Med, Fetscherstr 105, D-01307 Dresden, Germany
[2] San Raffaele Vita Salute Univ, Diabet Res Inst, Milan, Italy
[3] Queen Mary Univ London, Dept Immunobiol, Blizard Inst, London, England