Supplemental material for Rare primary headaches in Italian tertiary Headache Centres: Three year nationwide retrospective data from the RegistRare Network

Supplemental material for Rare primary headaches in Italian tertiary Headache Centres: Three year nationwide retrospective data from the RegistRare Network by Chiara Lupi, Luana Evangelista, Valentina Favoni, Antonio Granato, Andrea Negro, Lanfranco Pellesi, Raffaele Ornello, Antonio Russo, Sabina Cevoli, Simona Guerzoni and Silvia Benemei in Cephalalgia