1. Depressive symptoms, mental wellbeing, and substance use among adolescents before and during the COVID-19 pandemic in Iceland: a longitudinal, population-based study Thorisdottir, Ingibjorg E.; Asgeirsdottir, Bryndis Bjork; Kristjansson, Alfgeir L.; Valdimarsdottir, Heiddis; Jonsdottir Tolgyes, Erla Maria; Sigfusson, Jon; Allegrante, John P.; Sigfusdottir, Inga Dora; Halldorsdottir, Thorhildur 2021 Articles Teenagers--Substance useTeenagers--Mental healthCOVID-19 (Disease)--Social aspectsDepression, Mental
2. A multi-level developmental approach towards understanding adolescent mental health and behaviour: rationale, design and methods of the LIFECOURSE study in Iceland Halldorsdottir, Thorhildur; Kristjansson, Alfgeir L.; Asgeirsdottir, Bryndis Bjork; Thorisdottir, Ingibjorg E.; Sigfusson, Jon; Jonsdottir Tolgyes, Erla Maria; Valdimarsdottir, Heiddis; Allegrante, John P.; Sigfusdottir, Inga Dora 2020 Articles Teenagers--Mental healthBehavioral assessment of teenagerResearch--MethodologyChild development--Research--Methodology
3. Development and Guiding Principles of the Icelandic Model for Preventing Adolescent Substance Use Kristjansson, Alfgeir L.; Mann, Michael J.; Sigfusson, Jon; Thorisdottir, Ingibjorg E.; Allegrante, John P.; Sigfusdottir, Inga Dora 2020 Articles Substance abuse--PreventionYouth--Substance use--PreventionTeenagersHealth education
4. Implementación del Modelo Islandés para la Prevención del Uso del Sustancias en Adolescentes Kristjansson, Alfgeir L.; Mann, Michael J.; Sigfusson, Jon; Thorisdottir, Ingibjorg E.; Allegrante, John P.; Sigfusdottir, Inga Dora 2020 Articles Substance abuse--PreventionYouth--Substance use--PreventionTeenagersHealth education
5. Implementing the Icelandic Model for Preventing Adolescent Substance Use Kristjansson, Alfgeir L.; Mann, Michael J.; Sigfusson, Jon; Thorisdottir, Ingibjorg E.; Allegrante, John P.; Sigfusdottir, Inga Dora 2020 Articles Substance abuse--PreventionYouth--Substance use--PreventionTeenagersHealth education
6. Do population trends in adolescent electronic cigarette use coincide with changes in prevalence of cigarette smoking? Kristjansson, Alfgeir L.; Allegrante, John P.; Sigfusson, Jon; Sigfusdottir, Inga Dora 2019 Articles TeenagersTeenagers--Health and hygieneElectronic cigarettesSmoking