Usage History of 'progestogen'

The following chart shows how frequently 'progestogen' appeared in printed materials over time. For example, the word 'progestogen' occurred 12 times in books in 1928 and 3,107 times in 2008. From 1928 to 2008, the word 'progestogen' was used a total of 121,287 times in books scanned by Google. See Reference: Google Ngram project.

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