Effects of Combined vs. Single-Source Supportive Communication from Parents and Coaches on Mental Health and Self-Regulation in Adolescent Football Players. - Essid, Ameni; Bouzourraa, Mohamed Mansour; Sahli, Hajer; Dhahbi, Wissem; Ammar, Achraf; Trabelsi, Khaled; Jarraya, Mohamed; Zghibi, Makram (European Journal of Investigation in Health, Psychology & Education (EJIHPE), 2026)