 In order to avoid co-interaction, subjects were informed not to participate in any other exercise or treatment program until the end of the follow-up period. Also they were informed not to take any analgesic drug during the period of this treatment without the consent of the researchers. However, no patients requested for additional medication apart from the treatment in the department. The primary measure was pain intensity and the secondary outcome measure was disability index. They were measured by a separate physiotherapist who was independent 6 of the study every week of the treatment. Data for pre-treatment, third week, and six week of treatment were used for data analysis. 