1. Division of Rheumatology & Clinical Immunology, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong.
2. Department of Paediatrics & Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong.
3. Department of Paediatrics, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong.
4. Accident & Emergency Department, United Christian Hospital, Hong Kong.
5. 24-Hour Outpatient and Emergency Department, Gleneagles Hong Kong Hospital, Hong Kong.
6. Accident & Emergency Department, Prince of Wales Hospital, Hong Kong.
7. Private practice, Hong Kong.
8. Department of Paediatrics, Queen Elizabeth Hospital, Hong Kong.
9. Department of Paediatrics & Adolescent Medicine, Princess Margaret Hospital, Hong Kong.
10. Accident & Emergency Department, Tin Shui Wai Hospital, Hong Kong.
11. Accident & Emergency Department, Pok Oi Hospital, Hong Kong.
12. Accident & Emergency Department, Queen Elizabeth Hospital, Hong Kong.
13. Accident & Emergency Department, Tseung Kwan O Hospital, Hong Kong.
14. Accident & Emergency Department, Ruttonjee Hospital, Hong Kong.
15. Centre for Allergy and Asthma Care, Hong Kong.
16. Allergy Centre, Hong Kong Sanatorium and Hospital, Hong Kong.