1 School of Public Health, University College Cork, Ireland.
2 Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, The Netherlands.
3 MRC North West Hub for Trials Methodology Research, Department of Biostatistics, University of Liverpool, UK.
4 School of Nursing and Midwifery & Trials Methodology Research Network, National University of Ireland, Galway, Ireland.
5 School of Psychology, National University of Ireland, Galway, Ireland.