These two authors Fengqin Wang and Zhaoying Shi contributed equally to this work. Competing interests The authors declare that they have no competing interests. Authors’ contributions FW, YS, and YChen designed the work and analyzed the data. FW, ZS, YCui, and XG carried out the experiments. YChen and FW wrote the manuscript. All authors read and approved the final manuscript.
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Wang et al. (2015) studied this question.
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