Risk factors associated to disability in primary headaches: a systematic review to inform future iterations of the Global Burden of Disease Study.

Alberto Raggi, Matteo Castaldo, Chia-Chun Chiang, Soo Jin Cho, Min Kyung Chu, Adriana Della Pietra, Philip R Holland, Andreas Kattem Husøy, Alejandro Labastida-Ramírez, Ellina Lytvyak, Roberta Messina, Dilara Onan, Agnese Onofri, Raffaele Ornello, Lanfranco Pellesi