1. Student Research Group of the Developmental Disorders of Children and Youth, Department of Physiotherapy, Faculty of Health Sciences, Wroclaw Medical University, 50-367 Wroclaw, Poland
2. The Institute for Neuro-Physiological Psychology, Chester CH4 9BR, UK
3. Laboratory of Clinical Bases of Physiotherapy, Department of Physiotherapy, Faculty of Health Sciences, Wroclaw Medical University, 50-367 Wroclaw, Poland