1. Department of Public Health, Medical University of Lublin, Lublin, Poland
2. Department of International Health, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, The Netherlands
3. Section of Paediatrics, Imperial College London, London, UK
4. School of Nursing and Midwifery, Trinity College Dublin, the University of Dublin, Dublin, Ireland
5. Department of Child Health, TNO, Leiden, The Netherlands
6. Erasmus School of Social and Behavioural Sciences, Erasmus University Rotterdam, Rotterdam, The Netherlands
7. School of Social, Political and Global Studies and School of Primary, Community and Social Care, Keele University, Keele, UK
8. Department of Primary Care and Public Health, Imperial College London, London, UK