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In the original publication  was the name of one author in incorrect order.
Wrong: Nappi Giuseppe
Correct: Giuseppe Nappi
The original article was updated to rectify this error.
Stella Gagliardi and Gaetano Salvatore Grieco contributed equally to this work.
The online version of the original article can be found under doi:10.1186/s10194-017-0770-x
The online version of the original article can be found at http://dx.doi.org/10.1186/s10194-017-0770-x.