As promised here is a link to the Spine  article which examined neck pain associated disorders  httpwwwspinejournalcomptrespinefulltexthtmjsessionidHSQHcPMSkxnTnTkyrPTzcKLHhryQKLFyzlhLhvVBxnfBfindexdatabaseppvovftnavreference  Of particular importance is the following passage  Vertebrobasilar Stroke Study Findings There was an association between chiropractic services and subsequent vertebrobasilar artery stroke in persons under  years of age but a similar association was also observed among patients receiving general practitioner services This is likely explained by patients with vertebrobasilar artery dissectionrelated neck pain or headache seeking care before having their stroke  Hence there is no difference in association between stroke and DC and MD visits  This suggests that VB strokes are not necessarily caused by SMT or a visit to the DC but that they are already in progress prior to the visit  It should also be noted that there are  MDs involved in this study in case the argument of bias comes up  It will be interesting what CynRN and the stroke fear mongers have to say now that the evidence disputes their beliefs