1. Department of Psychiatry, Keele University, School of Postgraduate Medicine and Biological Sciences. North Staffordshire Hospital Centre, Thornburrow Drive, Hartshill, Stoke-on-Trent, Staffordshire ST4 7QB, UK
2. Mental Health Centre, 4 G.Soutsou Str., 12 243 Athens, Greece
3. Division of Psychiatry, United Medical and Dental Schools, Guy's Hospital, London SE1 9RT, UK