Author Contributions: Study concept and design: Kohsaka, Namiki, and Fukuda. Acquisition of data: Kohsaka and Namiki. Analysis and interpretation of data: Kohsaka, Endo, Ueda, and Namiki. Drafting of the manuscript: Kohsaka and Endo. Critical revision of the manuscript for important intellectual content: Kohsaka, Ueda, Namiki, and Fukuda. Statistical analysis: Kohsaka, Endo, and Ueda. Administrative, technical, and material support: Fukuda. Study supervision: Kohsaka and Namiki.
Financial Disclosure: None reported.