Recent investigation into opioid analgesic mechanisms in the fetus and neonate suggest that there are differences before and after birth (1).
Recent investigation into opioid analgesic mechanisms in the fetus and neonate suggest that there are differences before and after birth (1).
最近关于胎儿和新生儿阿片镇痛机制的研究表明：出生前后有所不同[1]。