orthopedic surgery such as musculotendinous lengthening and femoral derotation osteotomy, neurosurgery such as selective dorsal rhizotomy and intrathecal baclofen pump implantation, or botulinum toxin injection into gastrocnemius, medial hamstring and hip adductors in the past 12 months, and clinically evident unstable cardiac status, or any premorbid conditions. All participants in the experimental group performed a treadmill walking exercise for 30 minutes and conventional physical therapy. The treadmill walking exercise protocol for the current study consisted of 3–5 training sessions per week for 1–2 months (total 20 sessions). Participants in the control group received conventional physical therapy in the same sessions.