ZARCO-ALPUENTE, Alfredo, Víctor CIUDAD-FERNÁNDEZ, Rafael BALLESTER-ARNAL, Joël BILLIEUX, María Dolores GIL-LLARIO, Daniel L. KING, Inma MONTOYA-CASTILLA, Paula SAMPER and Jesús CASTRO-CALVO. Problematic internet use prior to and during the COVID-19 pandemic. Cyberpsychology: Journal of Psychosocial Research on Cyberspace. 2021, vol. 15, no. 4, p. Article 1. DOI: 10.5817/CP2021-4-1