How many disabled and psychiatric patients died because of Aktion T4?

Before 2013 it was believed, that during the Aktion T4, approximately 70.000 people were murdered in the euthanasia programme. Recently the German Federal Archives reported that research in the archives of former East Germany indicated that the number of victims in Germany and Austria from 1939 to 1945 was about 200.000 people and that another 100.000 people were victims in other European countries. The German  Aktion T4 centers upheld the resemblance of legality in keeping records and writing letters.

In Polish psychiatric hospitals no one was left behind during the Aktion T4. Killings were inflicted using gas-vans, sealed army bunkers and machine guns; families were not informed about the murdered relatives and the empty wards were handed over to the SS.