The following is the specific contributions of all authors.
Matsukawa: Protocol/project development, Acquisition of data,
Data analysis, Data management, Manuscript writing
Yoshino: Protocol, Critical revision of the manuscript
Fujita: Acquisition of data
Funahashi: Data analysis
Majima: Acquisition of data, Data management
Ishida: Data analysis
Kato: Data management
Gotoh: Protocol/project development, Manuscript editing,
supervision