1 Department of Intensive Care Medicine, Amsterdam University Medical Centers, Location VUmc, Postbox 7507, 1081HV, Amsterdam, The Netherlands. M.heldeweg@amsterdamumc.nl.
2 Amsterdam Leiden IC Focused Echography, Amsterdam, The Netherlands. M.heldeweg@amsterdamumc.nl.
3 Department of Intensive Care Medicine, Amsterdam University Medical Centers, Location VUmc, Postbox 7507, 1081HV, Amsterdam, The Netherlands.
4 Amsterdam Leiden IC Focused Echography, Amsterdam, The Netherlands.
5 Department of Internal Medicine, Amsterdam UMC, Section Acute Medicine, Location VUmc, Amsterdam, The Netherlands.