Effect of head and moisture exchangers on the prevention of ventilator-associated pneumonia in critically ill patients - Auxiliadora-Martins, Maria; Menegueti, Mayra Gonçalves; Nicolini, E. A.; Alkmim-Teixeira, G. C.; Bellíssimo-Rodrigues, Fernando; Martins-Filho, Olindo Assis; Basile Filho, Aníbal (Brazilian Journal of Medical and Biological Research, 2012)