Electromyographic activity of the orbicularis oris muscle in children with and without lip competence: A cross-sectional study. - Szyszka-Sommerfeld L; Machoy ME; Świtała J; Sycińska-Dziarnowska M; Woźniak K; Spagnuolo G; Esposito L; Rengo C (Advances in clinical and experimental medicine : official organ Wroclaw Medical University, 2026)