Expert Global citimpact: 35.67 Researcher at *To whom correspondence should be addressed; Centre for Clinical Research in Neuropsychiatry, School of Psychiatry and Clinical Neurosciences, The University of Western and North Metropolitan Health Service-Mental Health, Gascoyne House, John XXIII Avenue, Mt Claremont, WA 6010, Perth, ; tel: (08)9347-6439, fax: (08)9384-5128, e-mail: .