1. Murray CJL, Lopez AD (eds): The Global Burden of Disease: A comprehensive assessment of mortality, injuries, and risk factors in 1990 and projected to 2020. Cambridge MA: Harvard School of Public Health, 1996.
2. McGuffin P, Owen M, Gottesman II (eds): Psychiatric Genetics and Genomics. Oxford, 2002.
3. Kendell RE : The classification of depression: a review of contemporary confusion. Br J Psychiatry 1976; 129: 15–28.
4. Farmer A, McGuffin P : The classification of the depressions. Contemporary confusion revisited. Br J Psychiatry 1989; 155: 437–443.
5. World Health Organisation: The international classification of diseases 10 classification of mental and behavioural disorders. Diagnostic Criteria for Research. Geneva: WHO, 1993.