Is relatively young age within a school year a risk factor for mental health problems and poor school performance? A population-based cross-sectional study of adolescents in Oslo, Norway

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Lars Lien^*^†, Kristian Tambs^†, Brit Oppedal^†, Sonja Heyerdahl^† and Espen Bjertness^†

BMC Public Health 2005, 5:102 doi:10.1186/1471-2458-5-102