Evaluating Repetitive Transcranial Magnetic Stimulation for Refractory Chronic Cluster Headache Prevention: Insights from a Randomized Crossover Pilot Trial - Portocarrero-Sanchez, Leonardo; Rizea, Cristian; Diez-Tejedor, Exuperio; Leon-Ruiz, Moises; Diaz-de-Teran, Javier (BRAIN SCIENCES, 2025)