Additional effect of erenumab for patients with chronic migraine treated with onabotulinumtoxin A—real-world data from a preliminary cohort study oleh Tristan Koelsche, Petyo Nikolov, Valeria Koska, Jens Ingwersen, Robin Jansen, Ercan Arat, Sven G. Meuth, Philipp Albrecht, Philipp Albrecht, John-Ih Lee