1Department of Veterinary Basic Sciences, Royal Veterinary College, Royal College Street, London NW1 0TU, UK
2Musculoskeletal Research Group, Institute of Anatomy, Ludwig-Maximilians-Universität München, Pettenkoferstr. 11, D-80336 München, Germany
3Institute of Anatomy, Paracelsus Medizinische Privatuniversität, Salzburg, Austria
4Oral Diseases Research Centre, Royal London Medical School, Whitechapel, London, UK