Psychometric Properties of the Nine-Item Problematic Internet Use Questionnaire in a Brazilian General Population Sample by Daniel Tornaim Spritzer, Wagner de Lara Machado, Marina Balem Yates, Vitória Rech Astolfi, Pricilla Laskoski, Cristina Pessi, Stéphanie Laconi, Katarzyna Kaliszewska-Czeremska, Zsolt Demetrovics, Zsolt Demetrovics, Orsolya Király, Ives Cavalcante Passos, Ives Cavalcante Passos, Simone Hauck, Simone Hauck

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