Buyukaksu, Murat, Aslinur Sircan-Kucuksayan, and Murat Canpolat. “Measurement of Endothelial Function Using Photoplethysmography With Continuous Correction Approach: A Pilot Study”. International Journal of Advances in Medicine 8, no. 3 (February 23, 2021): 362–368. Accessed October 12, 2025. https://www.ijmedicine.com/index.php/ijam/article/view/2778.