1. Thomas Coram Research Unit, University College London Institute of Education, University College London, London, UK
2. The Leicester School of Nursing and Midwifery Research Centre, De Montfort University, Leicester, UK
3. Department of Applied Health Research, University College London, London, UK
4. School of Health and Education, Middlesex University, London, UK
5. Leicester Clinical Trials Unit, University of Leicester, Leicester, UK