Maximum likelihood (ML) is a popular method for inferring a phylogenetic tree of the evolutionary relationship of a set of taxa, from observed homologous aligned genetic sequences of the taxa. Generally, the computation of the ML tree is based on numerical methods, which in a few cases, are known to converge to a local maximum on a tree, which is suboptimal. The extent of this problem is unknow...

Background: Multiple pregnancies are responsible for the increased risk of maternal and neonatal morbidity and mortality. This study aimed to compare the perinatal outcome between multiple and singleton pregnancies. Materials and Methods: This is a retrospective cohort study. A sample of 50 multiple birth neonates- born in Fatemieh Hospital of Hamadan, Iran in 2015- was selected using simple r...