CALCA and migraine disorder: The log-likelihood ratio algorithm was employed for the clustering analysis, revealing 12 principal clusters in the field, as indicated in the cluster map (Q = 0.8105, S = 0.9414): Cluster #0 Monoclonal Antibody, Cluster #1 Eletriptan, Cluster #2 Telcagepant, Cluster #3 Non-Steroidal Anti-Inflammatory Drugs, Cluster #4 Almotriptan, Cluster #5 Transcranial Magnetic Stimulation, Cluster #6 Topiramate, Cluster #7 Calcitonin-Gene Related Peptide, Cluster #8 Etiology, Cluster #9 Acute Treatments, Cluster #10 Migraine Disorders, and Cluster #11 Children.