Delaruelle, Z. Ivanova, T.A. Khan, S. Negro, A. Ornello, R. Raffaelli, B. Terrin, A. Mitsikostas, D.D. Reuter, U., Male and female sex hormones in primary headaches, The Journal of Headache and Pain, (19), 2018, BioMed Central Ltd., 1129-2369, 1129-2377