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Nagoya University Graduate School of Medicine Nagoya, Japan
Shanghai Institute of Planned Parenthood Research Shanghai, China
Aichi Medical University School of Medicine Nagakute, Aichi, Japan
Fudan University School of Public Health Shanghai, China
Mie University Graduate School of Regional Innovation Studies Tsu, Mie, Japan
Emeritus Professor of Nagoya University Nagoya, Japan
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The authors declare no conflict of interest regarding this study.