Randomisation and blinding The randomisation sequence will be generated by a statistician not involved in the study. Randomisation will be done using block randomisation (block size 4 or 6) without stratification. The investigators will use sequentially numbered, opaque, sealed envelopes which have been pre-prepared in advance by the statistician. Women who fulfil the inclusion criteria will be randomised to active laser treatment or sham laser treatment. A research assistant not involved in the inclusion assessments will perform the randomisation, prepare and handle the allocated treatment device before and after each treatment session. The treatment will be given by a physiotherapist who is blinded to treatment group, the women's case history, questionnaires and clinical examinations.