Does anyone know the source of this graph
I am trying to reference it in an article that I have been asked to write for a physio journal in UK . I have seen it a few times but cannot find its origins
[ATTScreenshot 2016-09-30 12.22.54.jpgACH]1891[/ATTACH]
I am trying to reference it in an article that I have been asked to write for a physio journal in UK . I have seen it a few times but cannot find its origins
[ATTScreenshot 2016-09-30 12.22.54.jpgACH]1891[/ATTACH]
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