In the original publication of this article, the figure legends for Figures 1 and 2 misidentified which line in each graph corresponded to which treatment. Correct versions of the figures appear below.
The authors apologize for this error.
12th August 2024: digital purchasing is currently unavailable on Cambridge Core. Due to recent technical disruption affecting our publishing operation, we are experiencing some delays to publication. We are working hard to restore services as soon as possible and apologise for the inconvenience. For further updates please visit our website: https://www.cambridge.org/news-and-insights/technical-incident
Published online by Cambridge University Press: 12 November 2020