1. South East Wales Trials Unit, Cardiff University, Cardiff, UK (Dr Channon)
2. School of Health Care Sciences, Cardiff University, Cardiff, UK (Dr Lowes)
3. School of Medicine, Cardiff University, Cardiff, UK (Dr Gregory)
4. School of Psychology, Cardiff University, Cardiff, UK (Dr Grey)
5. College of Nursing, New York University, New York, USA (Dr Sullivan-Bolyai)