Related by context. Frequent words. (Click for all words.) 62 preterm deliveries 60 intracytoplasmic sperm injection 59 IVF ICSI 59 recurrent miscarriage 57 intrapartum 57 perinatal mortality 57 gestational age 57 congenital abnormalities 57 born preterm 56 Caesarean deliveries 56 maternal morbidity 56 neural tube defect 56 ovulated 55 polycystic ovary syndrome PCOS 55 placental tissue 55 Giraffe gives 54 birthweight 54 unexplained infertility 54 DuoFertility 54 multivariate logistic regression 53 luteal phase 53 weeks gestation 53 intrauterine insemination 53 folate supplementation 53 cesarean deliveries 53 Fertility clinics 53 spontaneous abortions 52 obstetric complications 52 follicle stimulating hormone FSH 52 menarche 52 preterm 52 postpartum hemorrhage 52 preterm delivery 52 low birthweight babies 52 congenital malformations 52 thrombophilia 52 low birthweight infants 52 congenital anomalies 52 caesarean delivery 52 posttreatment 51 irregular menstrual cycles 51 maternal fetal 51 gestational 51 embryo implantation 51 covariate 51 ultrasonographic 51 breastfed infants 51 Cesarean delivery 51 PROCHIEVE 51 cesarean delivery 51 subclinical hypothyroidism 51 pyelonephritis 51 Foetal 51 transvaginal ultrasound 51 IVF cycles 51 polycystic ovary syndrome 51 ovarian stimulation 51 folic acid supplement 51 varicocele 51 preimplantation genetic diagnosis 51 neural tube 51 Preterm 51 cervical mucus 50 progestogen 50 coronary revascularization 50 bilirubin levels 50 multivariate analyzes 50 captive giant pandas 50 Placental 50 NHANES III 50 embryo transfers 50 preterm babies 50 hyperbilirubinemia 50 conceiving naturally 50 neonates 50 follicle stimulating hormone 50 Baseline characteristics 50 logistic regression analysis 50 menstrual disorders 50 liver biopsies 50 Gestational diabetes 50 Human papillomavirus 50 serum concentrations 50 preventing ovulation 50 preterm births 50 low birthweight 49 Preterm birth 49 intrauterine 49 premature menopause 49 gynecologic procedures 49 ectopic pregnancies 49 prenatally 49 interquartile range 49 creatinine levels 49 fetal anomalies 49 thyroid stimulating hormone 49 ovulate 49 exhaled nitric oxide 49 potential confounders 49 chromosome abnormalities 49 glomerular filtration rate