[1] Florence Nightingale Sch Nursing & Midwifery, London SE1 8WA, England
[2] Kings Coll Hosp London, Dept Neurol, London, England
[3] Dulwich Community Hosp, MS Community Nurse Serv, London, England
[4] Univ E Anglia, Sch Nursing & Midwifery, Norwich NR4 7TJ, Norfolk, England
[5] Kings Coll London, Inst Psychiat, London WC2R 2LS, England