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Only three Nazi killing centers (NS-Tötungsanstalt) were used for the gassing of the "invalided" prisoners: Bernburg Euthanasia Centre (headed by Irmfried Eberl), Sonnenstein Euthanasia Centre (headed by Horst Schumann) and Hartheim Euthanasia Centre (headed by Rudolf Lonauer and Georg Renno).
Extermination centres were established at six existing pyschiatric hospitals: Bernburg, Brandenburg, Grafeneck, Hadamar, Hartheim, and Sonnenstein.