Regional Targeted Subcutaneous Injection of Botulinum Neurotoxin Type A in Refractory Chronic Migraine: A Randomized, Double-Blind, Placebo-Controlled Study oleh Francesco Bono, Maria Rosaria Mazza, Giuseppe Magro, Giorgio Spano, Giovanni Idone, Vincenzo Laterza, Denise Tedeschi, Francesco Pucci, Antonio Gambardella, Alessia Sarica