Author Contributions: Dr Wing accepts full responsibility for the conduct of the study, had access to the data, and controlled the decision to publish. All of the authors contributed to, revised, and approved the final manuscript. Study concept and design: Wing, Leung, Ma, and Fong. Acquisition of data: Wing, Yu, Leung, Ma, Kong, Yee, Fong, and Lam. Analysis and interpretation of data: M. H.-B. Lam, Wing, Yu, Ma, Kong, and S.-P. Lam. Drafting of the manuscript: M. H.-B. Lam, Wing, Yu, Leung, and S.-P. Lam. Critical revision of the manuscript for important intellectual content: Wing, Yu, Ma, Kong, Yee, Fong, and S.-P. Lam. Statistical analysis: Wing and Yu. Obtained funding: Wing and Leung. Administrative, technical, and material support: Wing, Ma, Kong, Yee, Fong, and S.-P. Lam. Study supervision: Wing and Ma.