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In page Anna Charlotte Ruys:

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From 1937-1950 she was chairman of the Medical Women's International Association. From 1947-1951 she was on the Dutch National UNESCO committee. During a trip to the USA she was involved in discussions about biological warfare, to which she was opposed. From 1949-1953 she was chairman of the medical faculty. She refused a request by the ministry of war to build a biological warfare laboratory and spoke out about it in February 1958.[citation needed]