1. Department of Anaesthesiology and Intensive Care Medicine, Evangelisches Krankenhaus Hubertus, Lehrkrankenhaus der Charité–Universitätsmedizin Berlin, Berlin, Germany.
2. Department of Bariatric Surgery, Klinik für Minimal Invasive Chirurgie (MIC) Berlin, Germany.
3. Department of Anesthesiology and Intensive Care Medicine, Campus Charité Mitte and Campus Virchow-Klinikum, Charité– Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
4. Institute of Biometry and Clinical Epidemiology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.