Gaceta Sanitaria

Smartphone use by children in fast food restaurants in Barcelona (Spain): a direct observation study Sonia de Paz-Cantos; Adrián González-Marrón; Cristina Lidón-Moyano; Íñigo Cabriada; María Cerrato-Lara; Rafael Gómez-Galán; José M. Martínez-Sánchez;