Impact on Transmissibility and Case Fatality Rate of COVID-19 of the Mandatory Face Shield Use in Addition to Mask during the Pandemic: The Philippine Experience. Acta Med Philipp [Internet]. 2024 Nov. 12 [cited 2025 Apr. 4];. Available from: https://actamedicaphilippina.upm.edu.ph/index.php/acta/article/view/10939