Richard Fielding* , Tran H. Bich†, La Ngoc Quang†, Wendy W.T. Lam‡, Gabriel M. Leung*, Truong Q. Tien†, Ella Y.Y. Ho*, and Le V. Anh†
Author affiliations: *University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China; †Hanoi School of Public Health, Ha Noi, Vietnam; ‡Chinese University of Hong Kong, Shatin, New Territories, Hong Kong Special Administrative Region, People’s Republic of China;
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