Secondary headache disorders in Turkey, the Middle East, Asia, and Africa: A cross-sectional, multicenter study. - Evlice, Ahmet; Genç, Hamit; Uluduz, Derya; Baykan, Betul; Bolay, Hayrunnisa; Unal-Cevik, Isin; Kissani, Najib; Luvsannorov, Otgonbayar; Togha, Mansoureh; Ozge, Aynur (Cephalalgia, 2023)