[Fewer psychiatric illnesses in the new German districts].
D003430:Cross-Sectional Studies; D005858:Germany; D006801:Humans; D015994:Incidence; D001523:Mental Disorders / Q000453:epidemiology*; D008605:Mental Health Services / Q000600:supply & distribution; D012307:Risk Factors; D012922:Social Change; D012931:Social Environment