1. Psychiatric Research Unit, Frederiksborg General Hospital, Denmark
2. The Botulinum Toxin Clinic, North Riding Infirmary, Middlesborough, U.K.
3. Hunters Moor Regional Rehabilitation Centre, University of Newcastle‐upon‐Tyne, U.K.
4. Department of Clinical Neurosciences, University of Newcastle‐upon‐Tyne, U.K.