doi: 10.1017/jpa.2017.92, Published online by Cambridge University Press, 4 December, 2017,
An incorrect version of the article by Schroeder, Paterson, and Brock (2017) was initially published. As such, the original version has been retracted, and the correct version of the article has been published (under doi: 10.1017/jpa.2018.6) online and in the print version of this issue. The original version has been updated to indicate the retraction, and the correct version is now the version of record.
Cambridge University Press and the Author regret this oversight.