Changes in delinquency according to socioeconomic status among Finnish adolescents from 2000 to 2015
Knaappila, Noora, Marttunen, Mauri, Fröjd, Sari, Lindberg, Nina, Kaltiala-Heino, Riittakerttu
Changes over time in mental health symptoms among adolescents in Tampere, Finland
Knaappila, Noora, Marttunen, Mauri, Fröjd, Sari, Kaltiala, Riittakerttu
Normative and negative sexual experiences of transgender identifying adolescents in the community
Heino, Elias, Fröjd, Sari, Marttunen, Mauri, Kaltiala, Riittakerttu