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