1. Department of Neurology, Royal Derby Hospital, University Hospitals of Derby and Burton Derby DE22 3NE United Kingdom
2. Department of Neurology, University Hospitals of Coventry and Warwickshire Coventry CV2 2DX United Kingdom
3. Department of Gastroenterology, University Hospitals of Coventry and Warwickshire Coventry CV2 2DX United Kingdom
4. Department of Medicine for the Elderly, Royal Derby Hospital, University Hospitals of Derby and Burton Derby DE22 3NE United Kingdom