Statistical methods
All statistical analysis were performed using SPSS (IBM Corp. IBM SPSS Statistics for MacOS, Version 25.0, Armonk, NY, USA) and were conducted according to the intention-to-treat principle. In order to prevent type I errors, per-protocol analysis was also conducted. Every outcome measure was compared between the control and intervention arms of the study. If there was equal variance of continuous variables, independent samples T test was used. Mann–Whitney U test was performed for the remainder of continuous variables. Wilcoxon ranked test was used for the analysis of non-normally distributed dependent variables. SF-36 questionnaire results were translated to percental values using the Orthotoolkit SF-36 software [