1. National Institute for Health and Clinical Excellence (NICE); Level 1A, City Plaza Piccadilly Plaza Manchester UK M1 4BD
2. National Institute for Health and Clinical Excellence (NICE); Centre for Clinical Practice; Peter House Oxford Street Manchester UK M1 5AN
3. University of Leicester; Department of Health Sciences; Leicester General Hospital Gwendolen Road Leicester UK LE5 4PW
4. Clinical Sciences Centre for Research & Education; University Department of Neurological Science; Lower Lane Liverpool Merseyside UK L9 7LJ
5. The University of Liverpool; Division of Public Health; Whelan Building The Quadrangle, Brownlow Hill Liverpool UK L69 3GB