Syndrome of subjective doubles
This syndrome is often diagnosed together with another mental disorder, such as schizophrenia or other disorders involving psychotic hallucinations.  There is no widely accepted method of treatment, as most patients require individualized therapy. The prevalence of this disease is relatively low, as few cases have been reported since the disease was defined in 1978 by George Nikolaos Christodoulou (b.1935), a Greek-American Psychiatrist. However, subjective doubles is not clearly defined in literature,  and therefore may be under-reported.