1. Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Operative Intensive Care Medicine (CCM, CVK), Berlin, Germany
2. Department of Anaesthesiology and Pain Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
3. Department of Anesthesiology, Facultad de Medicina de Valladolid, Hospital Universitario Rio Hortega, Valladolid, Spain
4. Department of Geriatric Surgery; Department of Anaesthesia, Analgesia and Intensive Care, Italian National Research Centres on Aging/IRCCS, Ancona, Italy
5. Department of Anesthesiology, Critical Care and Pain Medicine, ‘Sapienza’ University of Rome, Rome, Italy
6. Department of Anesthesiology, University of Wisconsin, Madison, Wisconsin, USA