1Department of Community Health Nursing, Division of Health Sciences and Nursing, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan
2Department of Statistic and Computer Science, College of Nursing Art and Science, University of Hyogo, Hyogo, Japan
3Department of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
4Department of Nursing, Faculty of Healthcare Sciences, Chiba Prefectural University of Health Sciences, Chiba, Japan
5Department of Medical Statistics, School of Nursing, Mejiro University, Saitama, Japan
6Faculty of Policy Studies, Doshisha University, Kyoto, Japan
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