1 Divison of Internal Medicine for the aged, Department of Rehabilitation and Geriatrics, University Hospitals of Geneva, Geneva, Switzerland.
2 Division of Geriatrics, Department of Rehabilitation and Geriatrics, University Hospitals of Geneva, Geneva, Switzerland.
3 Divison of Internal Medicine for the aged, Department of Rehabilitation and Geriatrics, University Hospitals of Geneva, Geneva, Switzerland; Division of Intensive Care, Department of Anesthesiology, Pharmacology and Intensive Care, University Hospitals of Geneva, Geneva, Switzerland. Electronic address: xavier.roux@hcuge.ch.