1. Migraine: epidemiology, burden, and comorbidity;Burch;Neurol Clin,2019
2. United Council for Neurologic Subspecialties. UCNS Fellowship Directory. 2019. Available at: ucns.org/Online/Fellowship_Directory/Online/Fellowship_Directory.aspx?hkey=ca0abd99-aad7-4e31-b735-6baddea75ca2. Accessed August 15, 2019.
3. Charmaz K . Constructing Grounded Theory: A Practical Guide through Qualitative Analysis. London: Sage Publications; 2012.
4. Grounded theory, mixed methods, and action research
5. National Resident Matching Program. About NRMP. 2019. Available at: nrmp.org/about-nrmp/. Accessed September 30, 2019.