PERFORMANCE MEASUREMENT OF HEALTH, SAFETY AND ENVIRONMENT (HSE) OF EXECUTIVE CONTRACTORS IN WATER AND WASTEWATER ORGANIZATION IN GUILAN PROVINCE USING QUALITY COEFFICIENT MODEL (Q), BASED ON DEMING CYCLE. AJBMR [Internet]. 2016 Feb. 5 [cited 2026 Jul. 28];5(6):47-54. Available from: https://j.arabianjbmr.com/index.php/ajbmr/article/view/896