Fall in new HIV diagnoses among men who have sex with men (MSM) at selected London sexual health clinics since early 2015: testing or treatment or pre-exposure prophylaxis (PrEP)? Brown, Alison E and Mohammed, Hamish and Ogaz, Dana and Kirwan, Peter D and Yung, Mandy and Nash, Sophie G and Furegato, Martina and Hughes, Gwenda and Connor, Nicky and Delpech, Valerie C and Gill, O Noel, Eurosurveillance, 22, 30553 (2017), https://doi.org/10.2807/1560-7917.ES.2017.22.25.30553