[1] Tech Univ Munich, TUM Sch Med & Hlth, Munich, Germany
[2] Tech Univ Munich, Ctr Organoid Syst, Garching, Germany
[3] Inst Diabet & Organoid Technol, Helmholtz Diabet Ctr, Helmholtz Zentrum Munchen, Neuherberg, Germany
[4] Tech Univ Munich, Munich Inst Biomed Engn MIBE, Munich, Germany
[5] German Ctr Diabet Res DZD, Neuherberg, Germany
[6] Univ Calif San Francisco, Diabet Ctr, Dept Med, San Francisco, CA 94143 USA