The Hong Kong Council on Smoking and Health (COSH), Hong Kong, China
Department of Anaesthesiology, The University of Hong Kong, Hong Kong, Hong Kong, China
2/F, 61 Lung Kong Rd, Kowloon City, Lok Sin Tong Benevolent Society, Hong Kong, China
The University of Hong Kong, Hong Kong, Hong Kong
Department of Anaesthesiology, The University of Hong Kong, Hong Kong, Hong Kong
New Territories East Cluster, Hospital Authority, Hong Kong, China
Hong Kong East Cluster, Hospital Authority, Hong Kong, China
Hong Kong West Cluster, Hospital Authority, Hong Kong, China
Department of Obstetrics and Gynaecology, PYNEH, Chai Wan, Hong Kong
Department of Obstetrics & Gynaecology, Queen Mary Hospital, Hong Kong, Hong Kong
Department of Obstetrics & Gynaecology, Kwong Wah Hospital, Mong Kok, Hong Kong
Research Site, Hong Kong, Hong Kong
Ivan Hung, Hong Kong, Hong Kong
The University of Hong Kong, Queen Mary Hospital, Hong Kong, Hong Kong, China