Habibzadeh, Farrokh, Parham Habibzadeh, and Mahboobeh Yadollahie. “On Measuring Vaccine Effectiveness With Observational Study Designs”. Acta Medica Academica 51, no. 2 (December 16, 2022): 134–146. Accessed April 15, 2024. https://www.ama.ba/index.php/ama/article/view/501.