Department of Paediatrics and Adolescent Medicine, Caritas Medical Centre, 111 Wing Hong Street, Sham Shui Po, Kowloon, Hong Kong, China
WW Cheng (鄭蕙蕙) MBBS, FHKAM
Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong, China
MHK Ho (何學工) MBBS, FHKAM
Department of Paediatrics and Adolescent Medicine, Prince Wales Hospital, 30-32 Ngan Shing Street, Shatin, N.T., Hong Kong, China
J Hui (許鍾妮) MBBS, FRACP, FRCP
Department of Paediatrics and Adolescent Medicine, Kwong Wah Hospital, 25 Waterloo Road, Kowloon, Hong Kong, China
KL Kwok (郭嘉莉) MBBS, FHKAM
Department of Paediatrics and Adolescent Medicine, Pamela Youde Nethersole Eastern Hospital, 3 Lok Man Street, Chai Wan, Hong Kong, China
EYW Kwan (關彥華) MBBS, FHKAM
Department of Paediatrics and Adolescent Medicine, Tseung Kwan O Hospital, Po Ning Lane, Hang Hau, Tseung Kwan O, N.T., Hong Kong, China
D Lau (劉進源) MBBS, FHKAM
Department of Paediatrics and Adolescent Medicine, Alice Ho Miu Ling Nethersole Hospital, 1 Chuen On Road, Tai Po, N.T., Hong Kong, China
KP Lee (李國彪) MBChB, FHKAM
Department of Paediatrics and Adolescent Medicine, Princess Margaret Hospital, 2-10 Princess Margaret Hospital Road, Lai Chi Kok, Kowloon, Hong Kong, China; and Yan Chai Hospital, 7-11 Yan Chai Street, Tsuen Wan, N.T., Hong Kong, China
SC Ling (凌紹祥) MBBS, FHKAM
Department of Paediatrics and Adolescent Medicine, United Christian Hospital, 130 Hip Wo Street, Kwun Tong, Kowloon, China
KL Ng (吳國樑) MBBS, FHKAM
Department of Paediatrics and Adolescent Medicine, Queen Elizabeth Hospital, 30 Gascoigne Road, Kowloon, Hong Kong, China
D Wong (黃美玲) MBBS, FHKAM
Department of Paediatrics & Adolescent Medicine, Tuen Mun Hospital, 23 Tsing Chung Koon Road, Tuen Mun, N.T., Hong Kong , China
LM Wong (黃立明) MBB, FHKAM
Correspondence to: Dr MHK Ho
Received January 27, 2010