1. Department of Obstetrics and Gynaecology, Tampere University Hospital, Tampere, Finland
2. School of Medicine, University of Tampere, BioMediTech, Tampere, Finland
3. Adult Stem Cell Group, University of Tampere, BioMediTech, Tampere, Finland
4. Science Center, Tampere University Hospital, Tampere, Finland
5. Department of Biomaterials Science and Technology, University of Twente, Enschede, The Netherlands