Executive summary on the use of ultrasound in the critically ill: consensus report from the 3rd Course on Acute Care Ultrasound (CACU) - Malbrain, Manu; Tavernier, Brecht; Haverals, Sandrine; Slama, Michel; Vieillard-Baron, Antoine; Wong, Adrian; Poelaert, Jan; Monnet, Xavier; Stockman, Willem; Elbers, Paul; Lichtenstein, Daniel (Anestezjologia Intensywna Terapia, 2017)