Merikukka, M., Ristikari, T., Paananen, R., & Gissler, M. (2017). Investigating the incidence of youth mental health problem by merging person register and school level class room survey data: IJPDS (2017) Issue 1, Vol 1:265 Proceedings of the IPDLN Conference (August 2016). International Journal of Population Data Science, 1(1). https://doi.org/10.23889/ijpds.v1i1.285