Depressive symptoms, major depressive episodes and cognitive test performance-What is the role of physical activity? - Joutsenniemi, Kaisla; Tuulio-Henriksson, Annamari; Elovainio, Marko; Härkänen, Tommi; Sainio, Päivi; Koskinen, Seppo; Pirkola, Sami; Partonen, Timo (Nordic Journal of Psychiatry, 2013)