Usage History of 'chronotherapy'

The following chart shows how frequently 'chronotherapy' appeared in printed materials over time. For example, the word 'chronotherapy' occurred 8 times in books in 1968 and 495 times in 2008. From 1968 to 2008, the word 'chronotherapy' was used a total of 9,614 times in books scanned by Google. See Reference: Google Ngram project.

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