1. Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong
2. Department of Paediatrics and Adolescent Medicine, Princess Margaret Hospital, Hong Kong
3. Haematology Laboratory, Department of Pathology, Princess Margaret Hospital, Hong Kong
4. Division of Chemical Pathology, Department of Pathology, Queen Mary Hospital, Hong Kong
5. Department of Pathology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong
6. Division of Transplantation and Immunogenetics, Department of Pathology, Queen Mary Hospital, Hong Kong
7. Division of Clinical Immunology, Department of Pathology, Queen Mary Hospital, Hong Kong
8. Division of Dermatology, Department of Medicine, Queen Mary Hospital, Hong Kong
9. Department of Ophthalmology and Visual Sciences, Chinese University of Hong Kong, Hong Kong
10. Department of Microbiology, Carol Yu Centre for Infection, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong
11. Division of Paediatric Surgery, Department of Surgery, The University of Hong Kong, Hong Kong; Dr Li Dak-Sum Research Centre, The University of Hong Kong–Karolinska Institutet Collaboration in Regenerative Medicine, The University of Hong Kong, Hong Kong
12. Department of Paediatric Infectious Diseases, Great Ormond Street Hospital for Children, London, United Kingdom; Institute of Child Health, University College London, London, United Kingdom
13. Section of Paediatrics, Imperial College London, London, United Kingdom
14. Paediatric Infectious Diseases Department, Imperial College Healthcare NHS Trust, London, United Kingdom