1. Department of Biomaterials; Faculty of Dentistry; University of Oslo; Oslo Norway
2. Department of Oral Biology; Faculty of Dentistry; University of Oslo; Oslo Norway
3. Department of Pathology; The Norwegian Radium Hospital; Oslo University Hospital; Oslo Norway
4. Center for Craniofacial Molecular Biology; The Herman Ostrow School of Dentistry; University of Southern California; Los Angeles CA USA