|Up a level|
Lorenc, T. and Marrero-Guillamon, Isaac and Aggleton, P. and Cooper, C. and Llewellyn, A. and Lehmann, A. and Lindsay, C. (2011) Promoting the uptake of HIV testing among men who have sex with men: systematic review of effectiveness and cost-effectiveness. Sexually Transmitted Infections 87 (4), pp. 272-278. ISSN 1368-4973.