Costa Monteiro, Sérgio, Liane Correia-Costa, and Elisa Proença. “Perfusion Index in Preterm Newborns During the First Week of Life and Association With Neonatal Morbimortality: A Prospective Observational Study”. Journal of Pediatric and Neonatal Individualized Medicine (JPNIM) 6, no. 2 (August 8, 2017): e060212. Accessed March 28, 2024. https://jpnim.com/index.php/jpnim/article/view/060212.