41. Moher D, Liberati A, Tetzlaff J, Altman DG. Preferred reporting items for systematic reviews and metaanalyses: the PRISMA statement. BMJ. 2009; 339:b2535. PMID: 19622551 42. Eide BI, Nilsen ABV, Rasmussen S. Births in two different delivery units in the same clinic—a prospective study of healthy primiparous women. BMC Pregnancy Childbirth. 2009; 9:25. 1186/1471-2393-9-25 PMID: 19545412 43. Monk A, Tracy M, Foureur M, Grigg C, Tracy S. Evaluating Midwifery Units (EMU): a prospective cohort study of freestanding midwifery units in New South Wales, Australia. BMJ Open. 2014; 4: e006252. PMID: 25361840 44. Ryan TD, Kidd GM. Maternal morbidity associated with in utero transfer. BMJ. 1989 Dec 2; 299:1383– 5. PMID: 2513972 45. Laube DW. Experience with an alternative birth center in a university hospital. J Reprod Med. 1983;391–6. PMID: 6887145 46. Kwong AJ, Chang MS, Tuomala RE, Riley LE, Robinson JN, Mutinga ML, et al. Peripartum care for mothers diagnosed with hepatitis B during pregnancy: a survey of provider practices. Matern Child Health J. 2018; 22:1345–51. PMID: 29512054 47. Eskes M, Waelput AJM, Scherjon SA, Bergman KA, Abu-Hanna A, Ravelli ACJ. Small for gestational age and perinatal mortality at term: An audit in a Dutch national cohort study. Eur J Obstet Gynecol Reprod Biol. 2017; 215:62–7. PMID: 28601729 48. Daemers DOA, Wijnen HAA, van Limbeek EBM, Bude´ LM, Nieuwenhuijze MJ, Spaanderman MEA, et al. The impact of obesity on outcomes of midwife-led pregnancy and childbirth in a primary care population: a prospective cohort study. BJOG. 2014; 121:1403–14. 12684 PMID: 24618305 49. George A, Dahlen HG, Blinkhorn A, Ajwani S, Bhole S, Ellis S, et al. Evaluation of a midwifery initiated oral health-dental service program to improve oral health and birth outcomes for pregnant women: a multi-centre randomised controlled trial. Int J Nurs Stud. 2018; 82:49–57. ijnurstu.2018.03.006 PMID: 29605753 50. Hollingworth J, Pietsch R, Epee-Bekima M, Nathan E. Time to delivery: transfers for threatened preterm labour and prelabour rupture of membranes in Western Australia. Aust J Rural Health. 2018; 26:42–7. PMID: 29168589 51. Morley K. Epilepsy in pregnancy: the role of the midwife in risk management. Br J Midwifery. 2018 Sep; 26(9):564–73. 52. Knox GE, Schnitker KA. In-utero transport. Clin Obstet Gynecol. 1984; 27(1):11–6. 1097/00003081-198403000-00005 PMID: 6705304 53. Cordero L, Schurman S, Zuspan FP. Appropriateness of antenatal referrals to a regional perinatal center. J Perinatol. 1989; 9(1):38–42. PMID: 2709150 54. Badgery-Parker T, Ford JB, Jenkins MG, Morris JM, Roberts CL. Patterns and outcomes of preterm hospital admissions during pregnancy in NSW, 2001–2008. Med J Aust. 2012; 196(4):261–5. https:// PMID: 22409693 55. Hutchinson FH, Davies MW. Time-to-delivery after maternal transfer to a tertiary perinatal centre. Biomed Res Int. 2014;325919. PMID: 24745012 56. Tucker J, McVicar A, Pitchforth E, Farmer J, Bryers H. Maternity care models in a remote and rural network: assessing clinical appropriateness and outcome indicators. Qual Saf Heal Care. 2010; 19:83–9. 57. Van Otterloo LR, Connelly CD. Risk-appropriate care to improve practice and birth outcomes. J Obstet Gynecol Neonatal Nurs. 2018; 47:661–72. PMID: 30196808 58. Posthumus AG, Borsboom GJ, Poeran J, Steegers EAP, Bonsel GJ. Geographical, ethnic and socioeconomic differences in utilization of obstetric care in the Netherlands. PLoS One. 2016; 11(6): e0156621. PMID: 27336409 59. Reddy K, Reginald P, Spring J, Nunn L, Mishra N. A free-standing low-risk maternity unit in the United Kingdom: does it have a role? J Obstet Gynaecol (Lahore). 2004; 24(4):360–6. 60. Nuovo J. Clinical application of a high-risk scoring system on a family practice obstetric service. J Fam Pract. 1985; 20(2):139–44. PMID: 3968521 61. Kim JJ, La Porte LM, Corcoran M, Magasi S, Batza J, Silver RK. Barriers to mental health treatment among obstetric patients at risk for depression. Am J Obstet Gynecol. 2010; 202:312.e1–312.e5. 62. Delaney-Black V, Lubchenco LO, Joseph Butterfield L, Goldson E, Koops BL, Lazotte DC. Outcome of very-low-birth-weight infants: are populations of neonates inherently different after antenatal versus neonatal referral? Am J Obstet Gynecol. 1989; 160(3):545–52. (89)80023-7 PMID: 2929672 ONE Risk selection in maternal and newborn care ONE | June 8, 2020 15 / 22 83 3 TOWARDS A BETTER UNDERSTANDING OF RISK SELECTION