Randomization
To allocate participants in groups, a block randomization was performed using an Excel file. First, a block to assign sample numbers equally to each group was generated. The block size was randomly generated (2-, 4- or 6-letter combination of A and B). Then each block was assigned to a group. Each participant was provided with the printed number, so the therapist could not predict which treatment placebo or craniosacral therapy) would be performed until the participant came.