Strengths and limitations
The main limitation of our study is the small sample size and random assignment of patients. As this study was initially designed as a pilot study, patients were not systematically invited to participate and therefore patients who met the inclusion criteria may have been missed. We did not collate numbers of patients who declined to participate on initial invitation, which would have allowed us to analyse the proportion of patients whom responded, in the context of the total number of patients that were eligible for participation.