Financial & competing interests disclosure
Frederick G Freitag is a member of the Board of Directors of the National Headache Foundation. He has served on Allergan’s International Botox in Headache Advisory Board. He has been a primary investigator for the Clinic for Allergan sponsored multicenter clinical trials and an investigator-initiated clinical trial. He received no income directly related to his role in these studies. The author has no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
No writing assistance was utilized in the production of this manuscript.