1. Private Practice, 6020-8171 Ackroyd Road, Richmond, British Columbia, Canada V6X 3K1
2. Professor in Paediatric Dentistry, Faculty of Dentistry, The University of Hong Kong, 2/F, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong, P R China
3. Associate Specialist in Paediatric Dentistry, Hon. Clinical Senior Lecturer, Department of Paediatric Dentistry, The London Hospital Dental Institute, Whitechapel, London E1 1BB, UK