Sungahid, Sara Kristel, and Albert Rafanan. “Pilot Study on the Comparison of Seven Commonly Used Over-the-Counter Pulse Oximeter Finger Devices”. Philippine Journal of Chest Diseases 23, no. 1 (June 6, 2025): 22–29. Accessed May 21, 2026. https://philippinejournalofchestdiseases.com/index.php/pjcd/article/view/10201.