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