Prieto Aimeda, D, et al. “Influence of Postural Treatment During Intrapleural Urokinase Administration in Patients With Empyema”. Cuestiones De Fisioterapia, vol. 15, no. 1, June 2000, pp. 07-13, http://cuestionesdefisioterapia.es/index.php/cf/article/view/480.