[1
]
North Wales Centre for Primary Care Research, College of Health & Behavioural Sciences,
Bangor University, Gwenfro Unit 4-8, Wrexham Technology Park Wrexham, UK LL13 7YP.
Electronic address: lewisr17@cardiff.ac.UK.
[2
]
North Wales Centre for Primary Care Research, College of Health & Behavioural Sciences,
Bangor University, Gwenfro Unit 4-8, Wrexham Technology Park Wrexham, UK LL13 7YP;
North Wales Organisation for Randomised Trials in Health (NWORTH), Bangor University,
The Normal Site, Holyhead Road, Gwynedd, UK LL57 2PZ.
[3
]
Department of Health Sciences, University of Leicester, 22-28 Princess Road West,
Leicester, UK LE1 6TP.
[4
]
Spinal Research Institute, University of Huddersfield, Queensgate, Huddersfield, UK
HD1 3DH.
[5
]
North Wales Centre for Primary Care Research, College of Health & Behavioural Sciences,
Bangor University, Gwenfro Unit 4-8, Wrexham Technology Park Wrexham, UK LL13 7YP.
[6
]
Sheffield Teaching Hospitals NHS Foundation Trust, Northern General Hospital, Herries
Road, Sheffield, UK S5 7AU.
[7
]
School of Human and Health Sciences, Swansea University, Singleton Park, Swansea,
UK SA2 8PP.
[8
]
Green Oak, Dolydd Terrace, Betws-Y-Coed, UK LL24 0BU.