Umblical cord blood pH, blood gases, creatin posphokinase and MB isoenzyme analyses in preterm infants of ritodrine administered 24-34 weeks pregnant women as an indicator of perinatal asphyxia . (2021). Annals of Medical Research, 3(2), 0101-0106. http://www.annalsmedres.org/index.php/aomr/article/view/2490