1. Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;
2. Department of Pediatrics, University Medical Center Groningen, Groningen, The Netherlands;
3. Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands; and
4. Department of Pediatric Oncology/Hematology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands