CONTRIBUTION TO AUTHORSHIP:
- Cavallaro A: conception, planning, data collection, data analysis and writing up of the article
- Ioannou C: data analysis and writing up of the article
- Garbagnati M and Hubble T: data collection
- Oros D: writing up of the article
- Impey L: conception, data analysis and writing up of the article.
DETAILS OF ETHICS APPROVAL: NHS Health Research Authority ethical approval for this analysis was granted on 27/07/2017 (IRAS project ID 222260; REC reference 17/SC/0374).
FUNDING The authors received no financial support for the research, authorship, and publication of this article.