1. Consultant Geriatrician, Department of Geriatric Medicine, Glan Clwyd District Hospital, Rhyl, Denbighshire LL18 5UJ, UK
2. General Practitioner, The Laurels, 73 Church Street, Flint, Flintshire CH6 5AF, UK
3. SpR in Anaesthetics and Intensive Care Medicine, Intensive Care Unit, Western Infirmary, Dumbarton Road, Glasgow G11 6NT, UK