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Vertebrate Zoology 64(2): 215-220
doi:
10.3897/vz.64.e31482
Published:
15 Jul 2014
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Authors
Jianli Xiong 
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Henan University of Science and Technology, Luoyang, China
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Conflict of interest
The authors have declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.