1. Department of Paediatrics and Adolescent Medicine , Hong Kong Children’s Hospital , Hong Kong , China
2. Department of Paediatrics and Adolescent Medicine , Princess Margaret Hospital , Hong Kong , China
3. Student Health Service, Department of Health , Hong Kong , China
4. Department of Paediatrics , Caritas Medical Centre , Hong Kong , China
5. Department of Paediatrics and Adolescent medicine , Queen Mary Hospital , Hong Kong , China
6. Department of Paediatrics , Prince of Wales Hospital , Hong Kong , China
7. Department of Paediatrics and Adolescent Medicine , Tuen Mun Hospital , Hong Kong , China
8. Department of Paediatrics , Queen Elizabeth Hospital , Hong Kong , China
9. Department of Paediatrics and Adolescent Medicine , United Christian Hospital , Hong Kong , China
10. Department of Paediatrics and Adolescent Medicine , Pamela Youde Nethersole Eastern Hospital , Hong Kong , China
11. Department of Paediatrics and Adolescent Medicine , Alice Ho Miu Ling Nethersole Hospital , Hong Kong , China
12. Department of Paediatrics and Adolescent Medicine , Tseung Kwan O Hospital , Hong Kong , China
13. Department of Paediatrics , Kwong Wah Hospital , Hong Kong , China