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WMA Declaration of Helsinki&mdash;Ethical Principles for Medical Research Involving Human Subjects [homepage on the Internet]. France: 2015 World Medical Association, Inc.; [cited 2014 Jan 15]. Available from: http:\/\/www.wma.net\/en\/30publications\/10policies\/b3\/index.html."},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Koyano W, Shibata H, Nakazato K, Haga H, Suyama Y. Measurement of competence: reliability and validity of the TMIG Index of Competence. Arch Gerontol Geriatr. 1991;13:103&ndash;16.","DOI":"10.1016\/0167-4943(91)90053-S"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Kitamura T, Hirano H, Chen Z, Hirata M. Factor structure of the Zung Self-rating Depression Scale in first-year university students in Japan. Psychiatry Res. 2004;128:281&ndash;7.","DOI":"10.1016\/j.psychres.2004.06.003"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Fujita K, Fujiwara Y, Chaves PH, Motohashi Y, Shinkai S. 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