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Contributors HTJ was the principal investigator. SS was the chief investigator and project supervisor. The protocol and interview schedule was developed by HTJ who collected the data and with SS analysed it and drafted the manuscript. HTJ is the guarantor. All authors had full access to all of the data in the study, and can take responsibility for the integrity of that data, and the accuracy of the data analysis.
Competing interests None.
Ethics approval Ethics approval was granted by the North Central London Research Consortium (REC No:11/H0722/1).
Provenance and peer review Not commissioned; internally peer reviewed.
Data sharing statement Copies of original interview transcripts are available. Contact the authors to request access.
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