Kutschke, J., Falch, A., Brandt, I., Nilsen, T.S., Jugessur, A., Halekoh, U., Seeman, T.E. and Harris, J.R. 2016. Social Factors and Health: Description of a new Norwegian twin study. Norsk Epidemiologi. 26, 1-2 (Jul. 2016). DOI:https://doi.org/10.5324/nje.v26i1-2.2021.