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Genetic and Environmental Etiology of Nicotine Use in Sri Lankan Male TwinsHelena M. S. Zavos, Yulia Kovas, Harriet A. Ball, David Ball, Sisira H. Siribaddana, Nick Glozier, Athula Sumathipala, Peter McGuffin, Matthew Hotopf, Frühling V. Rijsdijk · 2012