As a consequence of these findings, there is an increasing trend in research to identify risk factors for the apparition of this type of pathology in the different categories of premature infants; an example could be The Prematurity Respiratory Outcomes Program (PROP) [ 3 ], a research program that by collecting data from the population of premature neonates is aiming to identify the categories at risk for the occurrence of respiratory morbidity [ 3 ].
1
—
—