Conception and design: JC Wu, Tu, Huang, Ko, CL Wu, Cheng. Acquisition of data: Tu, Chang, CL Wu. Analysis and interpretation of data: JC Wu, Tu, Huang, Ko, Fay. Drafting the article: Tu. Critically revising the article: JC Wu, Huang, Chang, Fay, Cheng. Reviewed submitted version of manuscript: all authors. Approved the final version of the manuscript on behalf of all authors: JC Wu. Statistical analysis: Tu, Ko. Administrative/technical/material support: Huang, Cheng. Study supervision: Huang, Cheng.
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