1. Cardiff University; Cochrane Institute of Primary Care and Public Health, School of Medicine; 3rd Floor, Neuadd Meirionnydd Heath Park Cardiff Wales UK CF14 4XN
2. Cardiff University; South East Wales Trials Unit, Institute of Translation, Innovation, Methodology and Engagement; Neuadd Meirionnydd Heath Park Cardiff Wales UK CF14 4YS
3. University of Bristol; Academic Unit of Surgical Research, School of Social and Community Medicine; Bristol UK
4. Wales Deanery for Postgraduate Medical and Dental Education; 8th Floor, Neuadd Meirionnydd Heath Park Cardiff Wales UK CF14 4YS
5. Information Services, Cardiff University; Support Unit for Research Evidence (SURE); 1st Floor, Neuadd Meirionnydd Heath Park Cardiff Wales UK CF14 4YS
6. University of Bristol; Section of Healthcare Research, The School of Social and Community Medicine; Canynge Hall 39 Whatley Road Bristol UK BS8 2PS