Personalized mechanical ventilation guided by ultrasound in patients with acute respiratory distress syndrome (PEGASUS): study protocol for an international randomized clinical tri... by Sinnige, JS, Smit, MR, Ghose, A, de Grooth, H, Itenov, TS, Ischaki, E, Laffey, J, Paulus, F, Póvoa, P, Pierrakos, C, Pisani, L, Roca, O, Schultz, MJ, Szuldrzynski, K, Tuinman, PR, Zimatore, C, Bos, LDJ