1 Division of Clinical Immunology, Department of Pathology, Queen Mary Hospital, Pokfulam, Hong Kong.
2 Division of Rheumatology & Clinical Immunology, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong.
3 Division of Rheumatology & Clinical Immunology, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong. Electronic address: liphilip@hku.hk.