1. Department of Regenerative Biomaterials; Radboud University Medical Center; Philips van Leydenlaan 25, 6525 EX, Nijmegen The Netherlands
2. CAM Bioceramics B.V.; Zernikedreef 6, 2333 CL, Leiden The Netherlands
3. Department of Materials Science and Engineering; The Kroto Research Institute, The University of Sheffield; North Campus, Broad Lane, S3 7HQ, Sheffield UK
4. NOBIPOL, Department of Biotechnology and Food Science; Norwegian University of Science and Technology; Sem Saeland veg 6/8, NO-7491, Trondheim Norway