Rattanapunya S. Work Ability Index and improving work conditions for informal elderly workers in Muangkaen Pattana Municipality, Chiang Mai Province. Dis Control J [Internet]. 2019 Sep. 30 [cited 2024 May 4];45(3):245-57. Available from: https://he01.tci-thaijo.org/index.php/DCJ/article/view/160651