%0 Journal Article %T Normal reference ranges for cardiac valve cross-sectional areas in preterm infants %A Mahmood Dhahir Al-Mendalawi %J Archive of "Annals of Pediatric Cardiology". %D 2018 %R 10.4103/apc.APC_15_18 %X Sir %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5963249/