1. F. Wuytack, MChiro, School of Nursing and Midwifery, Trinity College Dublin, 24 D'Olier St, Dublin 2, Ireland.
2. E. Curtis, PhD, School of Nursing and Midwifery, Trinity College Dublin.
3. C. Begley, PhD, School of Nursing and Midwifery, Trinity College Dublin, and Institute of Health and Care Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.