Jakub Rusek, Karolina Piatikow, Michał Szalach, Mateusz Jasiński, Aleksandra Żywicka, Małgorzata Kuczek, et al. THE INFLUENCE OF THE SMARTPHONES ON THE DEVELOPMENT OF POSTURE AND MUSCLE DISORDERS IN THE HEAD AND NECK AREA BY CHILDREN AND YOUTH. IJITSS [Internet]. 2026 Mar. 12 [cited 2026 May 1];2(1(49). Available from: https://rspublisher.org/index.php/ijitss/article/view/4352