González-Grandas, F, and T Gallego-Izquierdo. 2012. “CREATION OF A QUESTIONNAIRE ABOUT THE PHYSIOTHERAPY ACTIVITY IN PATIENTS WITH NON-SPECIFIC LOW BACK PAIN”. Cuestiones De Fisioterapia 41 (1): 42-57. http://cuestionesdefisioterapia.es/index.php/cf/article/view/238.