Observational, open-label, non-randomized study on the efficacy of onabotulinumtoxinA in the treatment of nummular headache: The pre-numabot study

1. García-Azorín, D.
2. Trigo-López, J.
3. Sierra, Á.
4. Blanco-García, L.
5. Martínez-Pías, E.
6. Martínez, B.
7. Talavera, B.
8. Guerrero, Á.L.