“Follow the whistle: physical activity is calling you”: evaluation of implementation and impact of a Portuguese nationwide mass media campaign to promote physical activity

Marlene Nunes Silva^*, Cristina Godinho^*, Marta Salavisa^*, Katherine Owen^*, Rute Santos^*, Catarina Santos Silva^*, Romeu Mendes^*, Pedro J. Teixeira^*, Graça Freitas^*, Adrian Bauman^*

^*Corresponding author for this work