Changes of Physical Activity and Ultra-Processed Food Consumption in Adolescents from Different Countries during Covid-19 Pandemic: An Observational Study oleh María Belén Ruíz-Roso, Patricia de Carvalho Padilha, Diana C. Matilla-Escalante, Paola Brun, Natalia Ulloa, Diofanor Acevedo-Correa, Wilza Arantes Ferreira Peres, Miquel Martorell, Thais Rangel Bousquet Carrilho, Letícia de Oliveira Cardoso, Fernanda Carrasco-Marín, Katherine Paternina-Sierra, María-Carmen Lopez de las Hazas, Jhon E. Rodriguez-Meza, Luisa F. Villalba-Montero, Giulia Bernabè, Anthony Pauletto, Xhoajda Taci, Richar Cárcamo-Regla, J. Alfredo Martínez, Alberto Dávalos