Treatment dose To deliver an appropriate dose of energy according to the best available evidence and experience, the active treatment group received LLLT with a dual wavelength of 810 nm and 980 nm and a dose of 10 J/cm² vaginally and 10 J/cm² over the sacral areas. The control group will receive sham treatment by a red aiming beam with a power of 5 mW with the same treatment time as the active treatment.