4Sahni R. Noninvasive monitoring by photoplethysmography. Clin Pernatol, 2012, 39:573-583.
5De Felice C, Del Vecchio A, Criscuolo M, et al. Early postnatal changes in the perfusion index in term newborns with subclinical chorioamnionitis. Arch Dis Child Fetal Neonatal Ed, 2005, 90: F411-414.
6De Felice C, Latini G, Vacca P, et al. The pulse oximeter perfusion index as a predictor for high illness severity in neonates. Eur J Pediatr,2002,161:561-562.
7Granelli Ad, Ostman-Smith I. Noninvasive peripheral perfusion index as a possible tool for screening for critical left heart obstruction. Acta Paediatr, 2007, 96 : 1455-1459.
