There was a larger study done in china a few years earlier with more differentiated results and the correlations are indeed interesting: http://www.bmj.com/cont

There was a larger study done in china a few years earlier with more differentiated results and the correlations are indeed interesting: http://www.bmj.com/content/351/bmj.h3942 http://www.bmj.com/content/351/bmj.h3942 . But yeah, not a good article.