Related by context. Frequent words. (Click for all words.) 61 cesarean deliveries 61 cesareans 60 vaginal deliveries 59 cesarean delivery 59 vaginal births 59 perinatal mortality 59 caesareans 59 caesarean delivery 58 cesarean sections 58 comorbid conditions 58 episiotomies 57 uterine rupture 57 caesarean sections 57 Caesarean delivery 56 epidural anesthesia 56 low birthweight 56 Multiple births 55 Cesarean 55 preterm babies 55 congenital malformations 55 birthweight 55 nifedipine 55 uterine contractions 55 serum concentrations 54 postoperative complications 54 vaginal delivery 54 Oral contraceptives 54 preterm births 54 premenopausal breast cancer 54 hyperbilirubinemia 54 Hip fractures 54 menstrual bleeding 53 hypnotics 53 NUCYNTA ® 53 episiotomy 53 congenital abnormalities 53 Gestational diabetes 53 neural tube defect 53 childbirths 53 confounding variables 53 repeat revascularization 53 preterm delivery 52 Preterm birth 52 weeks gestation 52 morbidities 52 neonates 52 arousals 52 coronary revascularization 52 CMV infection 52 antihypertensive medications 52 neonatal mortality 52 colorectal adenomas 52 cryptorchidism 52 breastfed infants 52 hippocampal volume 52 low birthweight babies 52 births 52 systemic toxicity 51 progestogen 51 Pregnancies 51 eclampsia 51 serum sodium 51 gestational age 51 asthma exacerbations 51 folate intake 51 brain lesions 51 pregnancies 51 lamotrigine 51 Vitamin D supplements 51 oophorectomy 51 cerebrovascular events 51 hypoxemia 51 cardiorespiratory fitness 51 shoulder dystocia 51 Caesarean sections 51 polycystic ovary syndrome 51 heavy menstrual bleeding 51 Fibroids 51 preterm birth 51 spontaneous abortions 51 serum uric acid 51 fetal distress 51 glomerular filtration rate 51 de ath 51 intrauterine 51 gestational diabetes 51 Caesareans 50 nonadherence 50 gallbladder disease 50 Uterine fibroids 50 progestins 50 hypospadias 50 vaginal bleeding 50 Premature babies 50 lipid lowering therapy 50 vaginal birth 50 adrenal insufficiency 50 fetal abnormalities 50 amenorrhea 50 androgen deprivation 50 neonate