1. Department of Pain Medicine and Palliative Care, Mount Sinai Beth Israel, Icahn School of Medicine at Mount Sinai, NY, USA
2. Department of Neurology, Headache Program, Mount Sinai Beth Israel, Icahn School of Medicine at Mount Sinai, NY, USA
3. Danish Headache Center and Department of Neurology, University of Copenhagen, Glostrup Hospital, Denmark
4. Unit for Quality and Patient Safety, Capital Region of Denmark, Denmark
5. Department of Neurology, Montefiore Headache Center, and Department of Epidemiology and Population Health, Albert Einstein College of Medicine, NY, USA