Institution: | 1. Department of Companion Animal Clinical Studies, Faculty of Veterinary Science, University of Pretoria, , Onderstepoort, South Africa;2. Department of Medicine, Vitamin D Research Group, Manchester Royal Infirmary, , Manchester, UK;3. Division of Veterinary Clinical Studies, The Royal (Dick) School of Veterinary Studies, Hospital for Small Animals, Easter Bush Veterinary Centre, The University of Edinburgh, , Midlothian, UK |