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Contrary to the HN title, the paper is not about causal inference, it is a case-control study. A good primer on the limitations of case-control studies can be found here: https://www.medicalnewstoday.com/articles/280936#limitations

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The abstract of the study states, "These findings cannot be explained by any known risk factor for MS and suggest EBV as the leading cause of MS."

Your contrarian approach is detrimental to proper research. Authors have found a very strong link that cannot be explained by any other risk factors. What risk factors are you suggesting they should look into?

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