Cajal Orleans D, Gil E, Laguna P, Varon C, Testelman D, Buyse B, et al. Sleep apnea severity stratification by an FFT-based PPG-derived index. Jorn. jovenes investig. I3A [Internet]. 2022 Jul. 18 [cited 2025 Dec. 6];10. Available from: https://papiro.unizar.es/ojs/index.php/jji3a/article/view/6984