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Bratt, G. A., Edlund, M., Cullberg, M. , Hejdeman, B., Blaxhult, A. & Eriksson, L. E. (2009). Sexually transmitted infections (STI) in men who have sex with men (MSM). Open Infectious Diseases Journal, 3, pp. 118-127. doi: 10.2174/1874279301004010118