1. Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong, SAR, China.
2. Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.
3. Department of Orthopaedic Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts.
4. Harvard Center for Population and Development Studies, Harvard School of Public Health, Boston, Massachusetts.
5. Department of Orthopedic Surgery, University of Basel, Basel, Switzerland.