Awake prone positioning in nonintubated spontaneous breathing ICU patients with acute hypoxemic respiratory failure (PRONELIFE)—protocol for a randomized clinical trial oleh L. Morales-Quinteros, M. J. Schultz, A. Serpa-Neto, M. Antonelli, D. L. Grieco, O. Roca, N. P. Juffermans, C. de Haro, D. de Mendoza, Ll. Blanch, M. Camprubí-Rimblas, Gemma Gomà, A. Artigas-Raventós, for the PRONELIFE collaborative group