The health Oriented pedagogical project (HOPP) - a controlled longitudinal school-based physical activity intervention program.
Per Morten FredriksenOle Petter HjelleAsgeir MamenTrine J MezaAne C WesterbergPublished in: BMC public health (2017)
The study is registered in Clinical trials (ClinicalTrials.gov Identifier: NCT02495714 ) as of June 20th - 2015, retrospectively registered. The collection of baseline values was initiated in mid-January 2015.