Cervical Injection for Headache

http://journals.lww.com/em-news/Pages/videogallery.aspx?videoId=4&autoPlay=true

http://journals.lww.com/em-news/blog/M2E/pages/post.aspx?PostID=5

http://journals.lww.com/em-news/Fulltext/2014/11000/Emergentology__A_Needle_in_the_Neck.4.aspx