1. Bangor Institute for Health and Medical Research, School of Healthcare Sciences, Bangor University, Bangor, UK;
2. Faculty of Health Sport and Science, University of Stirling, Stirling, UK;
3. North Wales Organization for Randomized Trials in Health (NWORTH), Bangor University, Bangor, UK;
4. School of Psychology, Bangor University, Bangor, UK;
5. Queen’s Medical Centre, University of Nottingham, Nottingham, UK;
6. School of Healthcare Sciences, Bangor University, Bangor, UK;
7. Ysbyty Gwynedd, Betsi Cadwaladr University Health Board, Bangor, UK