1. Universitat Internacional de Catalunya; Department of Physical Therapy; Barcelona Spain
2. Ramon Llull University; Blanquerna School of Health Sciences; Barcelona Spain
3. California State University; Department of Physical Therapy; 6000 J St Sacramento California USA 95819
4. Universitat Internacional de Catalunya; Department of Physical Therapy, Biostatistics Unit; C/ Josep trueta, s/n Sant Cugat del Vallès Barcelona Spain 08195
5. University of Groningen, University Medical Center Groningen, Department of Paediatrics; Hanzeplein 1 Groningen Netherlands 9713 GZ
6. University of Barcelona; Department of Health and Applied Sciences, National Institute of Physical Education; Ave. de L'Estadi 12-22 Barcelona Barcelona Spain 08036
7. California State University; Department of Kinesiology; Northridge California USA