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DS Di Sun
BZ Bing-Yang Zhou
SL Sha Li
NS Ning-Ling Sun
QH Qi Hua
SW Shu-Lin Wu
YC Yun-Shan Cao
YG Yuan-Lin Guo
NW Na-Qiong Wu
CZ Cheng-Gang Zhu
YG Ying Gao
CC Chuan-Jue Cui
GL Geng Liu
JL Jian-Jun Li
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All the statistical analysis was performed using SPSS version 21.0 (SPSS Inc., Chicago Illinois, USA). Continuous variables with normal distribution were presented as mean ± SD and median (Q1–Q3 quartiles) represented continuous but with non-normal distribution variables. Categorical variables were presented as number (percentage). To compare the differences among groups, continuous parameters were analyzed with Student’ s t-test, analysis of variance (ANOVA) or Mann-Whitney U test. Categorical variables were analyzed using chi-square test and Fisher’s exact test if applicable. A p-value < 0.05 was considered significantly different.

Copyright and License information: The Author(s). ©2018
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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