Ritonga DR, Ashar T, Nurmaini N. THE INFLUENCE OF AGE, DURATION OF WORK, AND LENGTH OF EMPLOYMENT ON PULMONARY FUNCTION CAPACITY AMONG TRADERS AT MEDAN DELI MARKET IN 2024 . ijhes [Internet]. 2025Jan.8 [cited 2026Oct.7];8(1):54-. Available from: https://ijhes.com/index.php/ijhes/article/view/364