THE IMPACT OF VITAMIN B12 DEFICIENCY ON LEARNING PERFORMANCE AND NERVOUS SYSTEM FUNCTION IN SCHOOL-AGED CHILDREN. Amer. Jour. of Rese. in Human. and Soci. Scie. [Internet]. 2026 Mar. 19 [cited 2026 Apr. 29];46:53-60. Available from: https://americanjournal.org/index.php/ajrhss/article/view/3444