1. Stem Cells and Metabolism Research Program (STEMM), Faculty of Medicine, University of Helsinki , Helsinki 00014 , Finland
2. Medicum, Faculty of Medicine, University of Helsinki , Helsinki 00014 , Finland
3. Helsinki University Hospital, New Children's Hospital, Pediatric Research Center , Helsinki 00014 , Finland
4. Institute for Molecular Medicine Finland, FIMM, University of Helsinki , Helsinki 00014 , Finland
5. Department of Radiology, Helsinki University Hospital and University of Helsinki , Helsinki 00014 , Finland