Table 1. Inclusion and exclusion criteria.

Inclusion criteria	Exclusion criteria
English language	Language other than English
Original, peer-reviewed research articles	Not original, peer-reviewed research articles (e.g. theoretical or methodological papers, systematic reviews, books or book chapters, letters, dissertations, editorials, study protocols, conference papers, validation studies, etc.) or intervention studies
Study participants were adolescents (12–18 years), with or without mental health challenges or any potential diagnosis or comorbidity	Study participants were not adolescents as the defined age in the inclusion criteria
Mental health needs assessment as reported by adolescents themselves	Mental health needs were assessed or reported by other persons/means than adolescents (e.g. from parents or teachers questionnaires/reports, clinical data, etc.)