Early manifestations and first-contact incidence of schizophrenia in different cultures. A preliminary report on the initial evaluation phase of the WHO Collaborative Study on determinants of outcome of severe mental disorders.
Psychol Med. 1986 Nov;16(4):909-28.
Sartorius N, Jablensky A, Korten A, Ernberg G, Anker M, Cooper JE, Day R.
The results provide strong support for the notion that schizophrenic illnesses occur with comparable frequency in different populations and support earlier findings that the prognosis is better in less industrialized societies.