1. Department of Psychology; University of Chester; Parkgate Road Chester UK
2. Department of Primary Care and Public Health, North Wales Clinical School; Cardiff University; Gwenfro Building, Wrexham Technology Park, Croesnewydd Road Wrexham UK
3. School of Psychology; Bangor University; Brigantia Building, Penrallt Road Bangor UK
4. South East Wales Trials Unit, School of Medicine; Cardiff University School of Medicine; Neuadd Merionnydd, Heath Park Cardiff UK