N. K. Perevoshchikova, “PREVALENCE AND PREDICTORS OF TRANSFORMATION IN EXTRACURRICULAR EDUCATION PATTERNS AMONG FIRST-GRADE STUDENTS: A POPULATION-BASED STUDY”, МиД, no. 3, Sep. 2026, Accessed: Sep. 04, 2026. [Online]. Available: https://mednauki.ru/index.php/MD/article/view/1515