Author Contributions: Dr Uhara had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Uhara. Acquisition of data: Uhara, Koga, Takata, and Saida. Analysis and interpretation of data: Uhara, Koga, and Saida. Drafting of the manuscript: Uhara, Koga, and Takata. Critical revision of the manuscript for important intellectual content: Uhara and Saida. Administrative, technical, and material support: Uhara. Study supervision: Uhara and Saida.