Neck-specific strengthening exercise compared with placebo sham ultrasound in patients with migraine: a randomized controlled trial - Benatto, Mariana Tedeschi; Florencio, Lidiane Lima; Bragatto, Marcela Mendes; Dach, Fabiola; Fernández-de-las-Peñas, César; Bevilaqua-Grossi, Débora (BMC Neurology, 2022)