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. 2014 Feb 28;9(2):e89886. doi: 10.1371/journal.pone.0089886

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© 2014 Yu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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WQ: study area located in the western Qinling Mountains; MQ: study area located in the middle Qinling Mountains; EQ: study area located in the eastern Qinling Mountains.