|Preterm birth is defined as delivery before 37 weeks of gestation. It is the leading cause of neonatal death and infant mortality, often as a result of respiratory distress syndrome due to immature lung development Babies who survive are also at high risk of neurological disability and can experience further breathing, feeding, digestive, visual, and hearing problems. Observational studies have found that a prior history of preterm birth significantly
Births that follow spontaneous preterm labor (PTL) and preterm premature rupture of membranes (pPROM) are together designated as spontaneous preterm births. Spontaneous preterm births account for ~70% of all premature deliveries, where the remaining 30% are indicated as a result of maternal or fetal infection. Of those births classified as spontaneous preterm births, 64% are the result of preterm labor (PTL) and 36% are are the result of preterm premature rupture of membranes (pPROM).
High-impact journals are those considered to be highly influential in their respective fields. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.