Jugessur, A., Gjessing, H. K., Wilcox, A. J., Nguyen, T. T., Nilsen, R. M., Murray, J. C. and Lie, R. T. (2012) “Assessing the impact of nicotine dependence genes on the risk of facial clefts: An example of the use of national registry and biobank data”, Norsk Epidemiologi, 21(2). doi: 10.5324/nje.v21i2.1500.