1. Agelink MW, Boz C, Ullrich H, Andrich J (2002) Relationship between major depression and heart rate variability. Clinical consequences and implications for antidepressive treatment. Psychiatry Res 113: 139–149
2. Andreasen NC (1981) Scale for the assessment of negative symptoms (SANS) Iowa City, Department of Psychiatry, University of Iowa College of Medicine
3. Andreasen NC (1984) Scale for the assessment of positive symptoms (SAPS) Iowa City, Department of Psychiatry, University of Iowa College of Medicine
4. Asato N, Hirayasu Y, Ogura C et al. (1996) Are event-related potential abnormalities in schizophrenics trait or state dependent? In: Ogura C, Koga Y, Shimokochi M (eds) Recent advances in event-related brain potential research. Elsevier Science, Amsterdam, pp 564–567
5. Barta PE, Pearlson GD, Powers RE et al. (1990) Auditory hallucinations and smaller superior temporal gyral volume in schizophrenia. Am J Psychiatry 147: 1457–1462