What other sources do you have besides that one observational study?
This is a meta-analysis of 28 studies. "Of 5862 reports identified by the search, 28 met the inclusion criteria: 20 were cross-sectional and 8 were prospective cohort."
alt Hacker News
This is a meta-analysis of 28 studies. "Of 5862 reports identified by the search, 28 met the inclusion criteria: 20 were cross-sectional and 8 were prospective cohort."