1. EPIUnit – Instituto de Saúde Pública, Universidade do Porto, Porto, Portugal
2. Portugal Football School, Portuguese Football Federation, Oeiras, Portugal
3. Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), University Institute of Maia (ISMAI), Maia, Portugal
4. Research Centre in Physical Activity, Health and Leisure (CIAFEL), Faculdade de Desporto, Universidade do Porto, Porto, Portugal
5. Public Health Unit, ACES Douro I - Marão e Douro Norte, Northern Region Health Administration, Porto, Portugal