Ultrasound-Based Evaluation of Median Nerve and Flexor Pollicis Longus Tendon in Adolescents: Impact of Smartphone Overuse. - Esmerer, Emel; Özçetin, Mustafa; Ertürk, Saide; Akkuş, Erkan; Us, Mahmut Caner (Cerrahpaşa Medical Journal, 2026)