We would like to thank all the participants in the study. We would like to acknowledge the guidance of Jean M. Russell MA MSc FSS, Computer Officer/Statistician, University of Sheffield and Stephen Walters BSc, PGCE, MSc, PhD, CStat, Reader in Medical Statistics, University of Sheffield. We would like to thank Rebecca Roberts, Jo Pearce, Antony Renshaw, Kate Percival, Stephanie Parker, Fazeelat Akhtar, Catherine Cliff and Helen Nicholson, assistant researchers at the University of Sheffield.
The research on which this paper is based was funded by a programme grant from The Leverhulme Trust (award number F/00 118/AQ).
F. A. F., T. M. and R. B. F. designed the study. F. A. F., T. M. and S. E. W. carried out the study. T. M. analysed the data. F. A. F. and T. M. wrote the paper, which was critically read by all the authors. All authors contributed to the interpretation of the data and approved the final version.
The authors have no conflicts of interest.
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