1. Suzanne Dworak Peck School of Social Work, University of Southern California, Los Angeles, California, USA
2. Department of Statistics, Southern Methodist University, Dallas, Texas, USA
3. Centre for Health, Performance, and Wellbeing, Anglia Ruskin University, Cambridge, UK
4. Research and Development Unit, Parc Sanitari Sant Joan de Déu, Sant Boi de Llobregat, Barcelona, Spain