In the published version of this article (Chen, Xue & Hu Reference Chen, Xue and Hu2019) the name of one of the authors was incorrect and should have appeared as ‘Guoqing Hu’. This has been corrected online and in print.
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Published online by Cambridge University Press: 08 July 2019
In the published version of this article (Chen, Xue & Hu Reference Chen, Xue and Hu2019) the name of one of the authors was incorrect and should have appeared as ‘Guoqing Hu’. This has been corrected online and in print.