Author Contributions:Study concept and design: Goh. Acquisition of data: Goh, Tan, and Tran. Analysis and interpretation of data: Goh, Tan, Yip, and Cheng. Drafting of the manuscript: Goh. Critical revision of the manuscript for important intellectual content: Goh, Tan, Tran, Yip, and Cheng. Administrative, technical, and material support: Tan, Yip, and Cheng. Study supervision: Goh, Tan, Tran, and Cheng.