Standards for the design and conduct of systematic reviews with low-level laser therapy for musculoskeletal pain and disorders.

Definition. Low level laser therapy (LLLT) in musculoskeletal disorders refers to monochromatic light therapy with lasers which have a mean optical output of larger than 1 mW, i.e. lasers in classes III, IIIa and IV. A similar definition applies for light therapy with light emitting diodes (LEDT) when the mean optical output is larger than 1 mW. It should be made explicit whether the systematic review or meta-analysis includes either LLLT or LEDT, or both.