Correction: J Headache Pain 17, 49 (2016)

https://doi.org/10.1186/s10194-016-0631-z


In Fig. 2B of this article [1], the title group name NTG + VPAL appears duplicated, leading to confusion regarding the presentation of the results. The correct and incorrect version of Fig. 2 is given below:

Correct

figure a

Incorrect

figure b