Cohort Profile: The Tracking Opportunities and Problems Study (TOPP)-study of Norwegian children and their parents followed from infancy to early adulthood

Nilsen, W., Kjeldsen, A., Karevold, E. B., Skipstein, A., Sand Helland, M., Gustavson, K., … Mathiesen, K. S. (2017). Cohort Profile: The Tracking Opportunities and Problems Study (TOPP)-study of Norwegian children and their parents followed from infancy to early adulthood. International Journal of Epidemiology, 46(5), 1399-1399G. https://doi.org/10.1093/ije/dyx057