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The original version of this article unfortunately contained a mistake. In the caption of Fig. 1, “(a) Beijingyixianhong; (b) Heiyoutao; (c) Xuebaitao” was incorrect. The correct version should be “(a) Heiyoutao; (b) Beijingyixianhong; (c) Xuebaitao”.
The online version of the original article can be found at http://dx.doi.org/10.1631/jzus.B1400086
