Funding for this research was provided by:
Economic and Social Research Council (ES/P000681/1)
Received: 28 January 2019
Accepted: 22 November 2019
First Online: 18 December 2019
Change Date: 20 August 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/S13229-021-00462-6
: This article does not contain any studies with animals performed by any of the authors. The study involved analysis of summary data, which has already been made publicly available, hence it was granted an exempt from requiring ethics approval by the University of Glasgow’s College of Science and Engineering Ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.