Armijos Ayala AD, Chunchi Ayala LM. Usefulness of botulinum toxin in the treatment of chronic migraine. CD [Internet]. 2023Jan.5 [cited 2024Oct.2];7(1):97-112. Available from: https://cienciadigital.org/revistacienciadigital2/index.php/CienciaDigital/article/view/2447