[stewbrew]

I cannot access the original paper and I don't have the time for it. Was the study registered in advance? Did they also test other outcome variables and then did cherry picking? Which potential confounders did they test? How do they cope with the problem that they measured something at the end of a longer process?

When I see such studies, on closer inspection, they often turn out to be crap. It could be this really is a gem among a pile of gravels (my apologies if that were the case) but I'm sceptical.