Effect of prone positioning on the survival of patients with acute respiratory failure.

Gattinoni, L; Tognoni, G; Pesenti, A; Taccone, P; Mascheroni, D; Labarta, V; Malacrida, R; DI GIULIO, P; Fumagalli, R; Pelosi, PAOLO PASQUALINO; Brazzi, L; Latini, R; PRONE SUPINE STUDY, Group