1. Institute of Biomedical Aging Research (N.S., R.K., C.Z., P.J.-D., P.B.), Austrian Academy of Science, A6020 Innsbruck, Austria;
2. Institute of Pathology (L.B.), University Hospital Basel, CH4031 Basel, Switzerland;
3. Ludwig Boltzmann Institute for Andrology and Urology (E.P.), Hospital Lainz, A1130 Vienna, Austria