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. 2019 Dec 23;20(1):105. doi: 10.3390/s20010105

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Overall regression analysis of this study. The results of the regression analysis of this study are shown through arrows between the different factors. If the regression analysis following an arrow is of significance, the normalized coefficient data will have an asterisk (*). This indicates that the causal relationship has a direct effect, which can be confirmed by the letter. Otherwise, if the normalized coefficient data is not significant, there will be no asterisk, indicating that there is no direct effect, and the arrow segment does not exist.