Question: Am Spiegelgrund was the name of a children's clinic in Vienna where 789 children were killed under the Aktion T4, was a postwar name for mass murder through involuntary euthanasia in which Nazi controlled country?
Sentence (from "Am Spiegelgrund clinic"): Some died by lethal injection and gas poisoning; others by disease, undernourishment, exposure to the elements, and 'accidents' relating to their conditions.
Relevant evidence: No