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Zavos, H.M.S.; Kovas, Yulia; Ball, H.A.; Ball, D.; Siribaddana, S.H.; Glozier, N.; Sumathipala, A.; McGuffin, P.; Hotopf, H. and Rijsdijk, F.. 2012. Genetic and Environmental Etiology of Nicotine Use in Sri Lankan Male Twins. Behavior Genetics, 42(5), pp. 798-807. ISSN 0001-8244 [Article]

Ball, H.A.; Siribaddana, S.H,; Sumathipala, A.; Kovas, Yulia; Glozier, N.; Rijsdijk, F.; McGuffin, P. and Hotopf, M.. 2011. Genetic and environmental contributions to the overlap between psychological, fatigue and somatic symptoms: a twin study in Sri Lanka. Twin Research & Human Genetics, 14(1), pp. 53-63. ISSN 1832-4274 [Article]

Ball, H.A.; Sumathipala, A.; Siribaddana, S.H.; Kovas, Yulia; Glozier, N.; McGuffin, P. and Hotopf, M.. 2010. Aetiology of fatigue in Sri Lanka and its overlap with depression. The British Journal of Psychiatry, 197(2), pp. 106-113. ISSN 0007-1250 [Article]