• 1
    Hanson FW, Zorn EM, Tennant FR, Marianos S, Samuels S. Amniocentesis before 15 weeks' gestation: outcome, risks, and technical problems. Am J Obstet Gynecol 1987;156(6):15241531.
  • 2
    Hogge WA, Schonberg SA, Golbus MS. Chorionic villus sampling: experience of the first 1000 cases. Am J Obstet Gynecol 1986;154(6):12491252.
  • 3
    Nicolaides K, Brizot M, Patel F, Snijders R. Comparison of chorionic villus sampling and amniocentesis for fetal karyotyping at 10–13 weeks' gestation. Lancet 1994;344(8920):435439.
  • 4
    Tabor A, Philip J, Madsen M, Bang J, Obel EB, Norgaard-Pedersen B. Randomised controlled trial of genetic amniocentesis in 4606 low-risk women. Lancet 1986;1(8493):12871293.
  • 5
    Smidt-Jensen S, Permin M, Philip J, et al. Randomised comparison of amniocentesis and transabdominal and transcervical chorionic villus sampling. Lancet 1992;340(8830):12371244.
  • 6
    Cederholm M, Axelsson O. A prospective comparative study on transabdominal chorionic villus sampling and amniocentesis performed at 10–13 week's gestation. Prenat Diagn 1997;17(4):311317.
  • 7
    The Canadian Early and Mid-Trimester Amniocentesis TrialRandomised trial to assess safety and fetal outcome of early and midtrimester amniocentesis. Lancet 1998;351(9098):242247.
  • 8
    Thompson PJ, Greenough A, Nicolaides KH. Lung volume measured by functional residual capacity in infants following first trimester amniocentesis or chorionic villus sampling. Br J Obstet Gynaecol 1992;99(6):479482.
  • 9
    Firth HV, Boyd PA, Chamberlain PF, MacKenzie IZ, Morriss-Kay GM, Huson SM. Analysis of limb reduction defects in babies exposed to chorionic villus sampling. Lancet 1994;343(8905):10691071.
  • 10
    Greenough A, Naik S, Yuksel B, Thompson PJ, Nicolaides KH. First-trimester invasive procedures and congenital abnormalities. Acta Paediatr 1997;86(11):12201223.
  • 11
    Tabor A, Jonsson MH. Psychological impact of amniocentesis on low-risk women. Prenat Diagn 1987;7(6):443449.
  • 12
    Sjögren B, Uddenberg N. Prenatal diagnosis and psychological distress: amniocentesis or chorionic villus biopsy?. Prenat Diagn 1989;9(7):477487.
  • 13
    Cederholm M, Axelsson O, Sjöden PO. Women's knowledge, concerns and psychological reactions before undergoing an invasive procedure for prenatal karyotyping. Ultrasound Obstet Gynecol 1999;14(4):267272.
  • 14
    Working Party on AmniocentesisAn assessment of the hazards of amniocentesis. Report to the Medical Research Council by their Working Party on Amniocentesis. Br J Obstet Gynaecol 1978;85(Suppl 2):141.
  • 15
    Eriksen G, Wohlert M, Ersbak V, Hvidman L, Hedegaard M, Skajaa K. Placental abruption. A case–control investigation. Br J Obstet Gynaecol 1991;98(5):448452.
  • 16
    Sundberg K, Bang J, Smidt-Jensen S, et al. Randomised study of risk of fetal loss related to early amniocentesis versus chorionic villus sampling. Lancet 1997;350(9079):697703.
  • 17
    Rhoads GG, Jackson LG, Schlesselman SE, et al. The safety and efficacy of chorionic villus sampling for early prenatal diagnosis of cytogenetic abnormalities. N Engl J Med 1989;320(10):609617.
  • 18
    The NICHD National Registry for Amniocentesis Study GroupMidtrimester amniocentesis for prenatal diagnosis. Safety and accuracy. JAMA 1976;236(13):14711476.
  • 19
    Crandall BF, Howard J, Lebherz TB, Rubinstein L, Sample WF, Sarti D. Follow-up of 2000 second-trimester amniocenteses. Obstet Gynecol 1980;56(5):625628.
  • 20
    Tongsong T, Wanapirak C, Sirivatanapa P, Piyamongkol W, Sirichotiyakul S, Yampochai A. Amniocentesis-related fetal loss: a cohort study. Obstet Gynecol 1998;92(1):6467.
  • 21
    Cnattingius S, Ericson A, Gunnarskog J, Källén B. A quality study of a medical birth registry. Scand J Soc Med 1990;18(2):143148.
  • 22
    Ahluwalia IB, Merritt R, Beck LF, Rogers MR. Multiple lifestyle and psychosocial risks and delivery of small for gestational age infants. Obstet Gynecol 2001;97(5 Pt 1):649656.
  • 23
    Morrison J, Najman JM, Williams GM, Keeping JD, Andersen MJ. Socio-economic status and pregnancy outcome. An Australian study. Br J Obstet Gynaecol 1989;96(3):298307.
  • 24
    Nodtvedt AM, Jacobsen G, Balstad P. Sosial klasse og fodselsvekt. Tidsskr Nor Laegeforen 1999;119(30):44554459.
  • 25
    Sobal J, Stunkard AJ. Socioeconomic status and obesity: a review of the literature. Psychol Bull 1989;105(2):260275.
  • 26
    Laitinen J, Power C, Järvelin M. Family social class, maternal body mass index, childhood body mass index, and age at menarche as predictors of adult obesity. Am J Clin Nutr 2001;74(3):287294.
  • 27
    Finegan JK, Quarrington BJ, Hughes HE, et al. Midtrimester amniocentesis: obstetric outcome and neonatal neurobehavioral status. Am J Obstet Gynecol 1984;150(8):989997.
  • 28
    Cnattingius S, Haglund B, Meirik O. Cigarette smoking as risk factor for late fetal and early neonatal death. BMJ 1988;297(6643):258261.
  • 29
    Cnattingius S, Forman MR, Berendes HW, Graubard BI, Isotalo L. Effect of age, parity, and smoking on pregnancy outcome: a population-based study. Am J Obstet Gynecol 1993;168(1 Pt 1):1621.
  • 30
    Brumfield CG, Lin S, Conner W, Cosper P, Davis RO, Owen J. Pregnancy outcome following genetic amniocentesis at 11–14 versus 16–19 weeks' gestation. Obstet Gynecol 1996;88(1):114118.
  • 31
    Hunter AG. Neonatal lung function following mid-trimester amniocentesis. Prenat Diagn 1987;7(6):433441.