title: A red light for blue light.
authors.affiliation: Department of Urology, Guy's Hospital, London, UK. Eleanor.ray@gstt.nhs.uk
authors.forename: Eleanor R
authors.initials: ER
authors.lastname: Ray
authors.forename: Tim S
authors.initials: TS
authors.lastname: O'Brien
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D005062:European Union; D006291:Health Policy; D006801:Humans; D017410:Practice Guidelines as Topic; D006113:United Kingdom