Alexiou, Vangetis G. Ierodiakonou, Vrettos Dimopoutos, George and Falagas, Matthew E., Impact of patient position on the incidence of ventilator-associated
pneumonia: A meta-analysis of randomized controlled trials, Journal of Critical Care, (24), 515-522, 2009, W B SAUNDERS CO-ELSEVIER INC, 0883-9441