1 Skeletal Biology Group, Department of Comparative Biomedical Sciences, Royal Veterinary College, London, UK. apitsillides@rvc.ac.uk.
2 Department of Physiology and Pharmacology, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada. fbeier@uwo.ca.
3 Bone and Joint Institute, University of Western Ontario, London, Ontario, Canada. fbeier@uwo.ca.