Chronic bronchitis and associated factors in workers at a South African welding company . AJBR [اینترنت]. 31 ژانویه 2021 [ارجاع شده 6 آوریل 2026];24(1):47-52. قابل دسترس در: https://www.ojshostng.com/index.php/ajbr/article/view/52