ARTICLE delRioCarral_METHODSINPSYCHOLOGY_2021/IDIAP Professional YouTubers? health videos as research material: Formulating a multi-method design in health psychology del Río Carral, María Volpato, Lucia Michoud, Chloé Phan, Thanh-Trung Gatica-Perez, Daniel EXTERNAL http://publications.idiap.ch/attachments/papers/2021/delRioCarral_METHODSINPSYCHOLOGY_2021.pdf PUBLIC Methods in Psychology, Special Issue on Innovations in Qualitative Research 5 2021