<p>* Described in detail in reference <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0067933#pone.0067933-Turner3" target="_blank">[8]</a>.</p
<p>PRISMA flow diagram of study selection [<a href="http://www.plosone.org/article/info:doi/10.1371/...
<p>Flow diagram of the literature search [<a href="http://www.plosone.org/article/info:doi/10.1371/j...
<p>Flow diagram demonstrating the selection of studies included in this review [<a href="http://www....
<p>Adapted from Moher et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone....
<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0100008#pone-0100008-g001" ...
<p>Adapted from the CONSORT flow diagram (<a href="http://www.plosone.org/article/info:doi/10.1371/j...
<p>References for the citations excluded after full-text review are provided in <a href="http://www....
<p>Adapted from De Mello et al <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone...
<p>*Data from Lu <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0070990#pone....
<p>Flow diagram of studies selected according to PRISMA guidelines [<a href="http://www.plosone.org/...
<p>Flow diagram of study identification, screening, eligibility and inclusion (adapted from [<a href...
<p>For details of the excluded studies, see <a href="http://www.plosone.org/article/info:doi/10.1371...
<p>The focused sub-populations are encircled. Description of study population <a href="http://www.pl...
<p>Study selection flow diagram (adapted from Moher et al, 2009)[<a href="http://www.plosone.org/art...
<p>The PRISMA flow diagram of study selection [<a href="http://www.plosone.org/article/info:doi/10.1...
<p>PRISMA flow diagram of study selection [<a href="http://www.plosone.org/article/info:doi/10.1371/...
<p>Flow diagram of the literature search [<a href="http://www.plosone.org/article/info:doi/10.1371/j...
<p>Flow diagram demonstrating the selection of studies included in this review [<a href="http://www....
<p>Adapted from Moher et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone....
<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0100008#pone-0100008-g001" ...
<p>Adapted from the CONSORT flow diagram (<a href="http://www.plosone.org/article/info:doi/10.1371/j...
<p>References for the citations excluded after full-text review are provided in <a href="http://www....
<p>Adapted from De Mello et al <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone...
<p>*Data from Lu <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0070990#pone....
<p>Flow diagram of studies selected according to PRISMA guidelines [<a href="http://www.plosone.org/...
<p>Flow diagram of study identification, screening, eligibility and inclusion (adapted from [<a href...
<p>For details of the excluded studies, see <a href="http://www.plosone.org/article/info:doi/10.1371...
<p>The focused sub-populations are encircled. Description of study population <a href="http://www.pl...
<p>Study selection flow diagram (adapted from Moher et al, 2009)[<a href="http://www.plosone.org/art...
<p>The PRISMA flow diagram of study selection [<a href="http://www.plosone.org/article/info:doi/10.1...
<p>PRISMA flow diagram of study selection [<a href="http://www.plosone.org/article/info:doi/10.1371/...
<p>Flow diagram of the literature search [<a href="http://www.plosone.org/article/info:doi/10.1371/j...
<p>Flow diagram demonstrating the selection of studies included in this review [<a href="http://www....
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