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. 2018 Nov 13;10(1):67–77. doi: 10.3892/mco.2018.1763

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Copyright: © Xiao et al.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Figure 1. — A flow diagram demonstrating the study selection process. Initially, a total of 231 records were identified on the database. Duplicate records were excluded to make sure each paper was only represented once within our set of records. A total of 28 records were excluded after reading the titles or the abstracts as these studies were reviews, meta-analyses, studies that were not in English or the full text was not available. After full-text reading of the studies that were not on human subjects, not clinical studies or without available data another 186 records were excluded. This process led to the identification of 15 studies eligible for systematic review.