Outline of search strategy for English-language and Chinese-language manuscripts.

<p>¹Substantial overlap defined by at least 30% similarity in the <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s1" target="_blank">introduction</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s2" target="_blank">methods</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s3" target="_blank">results</a>, or <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s4" target="_blank">discussion</a>. ²Minor overlap defined by less than 30% similarity in the <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s1" target="_blank">introduction</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s2" target="_blank">methods</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s3" target="_blank">results</a>, and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022149#s4" target="_blank">discussion</a>.