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In the 1960s the World Health Organization (WHO) carried out an Internationa Study of Schizophrenia (IPSS), a transcultural investigation of more than 1200 patients ii countries: China, Colombia, Czechoslovakia, Denmark, India, Nigeria, United Kingdom, and USSR. The study established that large-scale international psychiatric studies are feasi produced standardized instruments allowing reliable assessment of people suffering from r disorders in different cultures and created a network of centres able and willing to work to in psychiatric research.

The study established that schizophrenic disorders exist in different parts of the world an the features of their clinical conditions were marked by their similarity rather than differeno follow-up of the patients over a period of five years demonstrated that a significant proport people in whom a schizophrenic syndrome had been diagnosed recovered well and th percentage of …