Diagnostic accuracy of a prototype rapid chlamydia and gonorrhoea recombinase polymerase amplification assay: a multicentre cross-sectional preclinical evaluation by Harding-Esch, EM, Fuller, SS, Chow, S-LC, Nori, AV, Harrison, MA, Parker, M, Piepenburg, O, Forrest, MS, Brooks, DG, Patel, R, Hay, PE, Fearnley, N, Pond, MJ, Dunbar, JK, Butcher, PD, Planche, T, Lowndes, CM, Sadiq, ST