Mask mechnics and leak dynamics during noninvasive pressure support ventilation: a bench study - Schettino, Guilherme Paula Pinto; Tucci, Mauro Roberto; Sousa, Rogério; Barbas, Carmen Silvia Valente; Amato, Marcelo Britto Passos; Carvalho, Carlos Roberto Ribeiro de (Intensive Care Medicine, 2001)