1 First Department of Intensive Care Medicine, Medical School, National and Kapodistrian University of Athens, Athens, Greece. sdmentzelopoulos@yahoo.com.
2 Department of Intensive Care Medicine, Evaggelismos General Hospital, 45‑47 Ipsilandou St, 10675, Athens, Greece. sdmentzelopoulos@yahoo.com.
3 Institute for Translational Medicine and Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19104‑5158, USA.
4 Outcomes Research Consortium, Cleveland, OH, 44195, USA.