Effect size plot LLLT trials. Effect/size plot for LLLT trials. Open circles indicate trials with non-optimal treatment, and black circles indicate trials with optimal dose and treatment procedure. Effect over placebo is related to the x-axis and sample size is related to the y-axis.
Bjordal et al. BMC Musculoskeletal Disorders 2007 8:51 doi:10.1186/1471-2474-8-51