Received Date: 01 Oct 2014
Revision Received Date: 08 Dec 2014
Electronic Publication Date: 30
This study was financially supported by the Faculty of Dentistry. The authors wish to thank the children and adolescents, as well as their families, who joined the study. The authors also thank the staff at the ward and outpatient clinic of the Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, for patient recruitment. This study has been developed as a community health project, and the authors would like to thank Drs. CK Cheung, SL Cheung, MN Kwok, WS Yuen, KT Tang, ML Tsang and SW Wong for their contributions to the study.