On: Why the yakuza are not illegal

[iamthepieman]

As far as I know it is genetic. There was a study done in Denmark I believe that showed a strong correlation between febrile siezures after the MMR vaccine and a couple of genetic markers. My searching is failing me or I'd link it.

Edit: here it is: http://www.nature.com/ng/journal/v46/n12/full/ng.3129.html Notice that is was published less than a year ago.