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A 1999 Russian study put the number of patients in hospital with Psychosomatic disorders (i.e. illness without physical cause ) at over 50%
See: Psychosomatic disorders (clinical picture, epidemiology, therapy and models of health services in: Zh Nevrol Psikhiatr Im S S Korsakova, 99(4):4-16
Other colloquial reports in the UK put the figure lower, at around 20% The true figure is currently unknown.
Also see Current Psychosomatic Practice