1. Department of Biomaterials; Radboud University Medical Centre; P.O. Box 9101 6500 HB Nijmegen The Netherlands
2. Prometheus; Division of Skeletal Tissue Engineering; Katholieke Universiteit Leuven; 3000 Leuven Belgium
3. Skeletal Biology and Engineering Research Center; Department of Development and Regeneration; Katholieke Universiteit Leuven; 3000 Leuven Belgium
4. Department of Medical Microbiology; Radboud University Medical Centre; 6500 HB Nijmegen The Netherlands