<p>Site numbers correspond to those in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019489#pone-0019489-g002" target="_blank">Figures 2</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019489#pone-0019489-g003" target="_blank">3</a>.</p
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