• Aabakke AJ, Willer H, Krebs L. The effect of maneuvers for shoulder delivery on perineal trauma: a randomized controlled trial. Acta obstetricia et gynecologica Scandinavica. 2016;95(9):1070-7.
• Aasheim V, Nilsen AB, Lukasse M, Reinar LM. Perineal techniques during the second stage of labour for reducing perineal trauma. The Cochrane database of systematic reviews. 2011(12):Cd006672.
• Aasheim V, Nilsen ABV, Reinar LM, Lukasse M. Perineal techniques during the second stage of labour for reducing perineal trauma. Cochrane Database Syst Rev. 2017 Jun 13;6(6):CD006672.
• Albers LL, Sedler KD, Bedrick EJ, Teaf D, Peralta P. Midwifery care measures in the second stage of labor and reduction of genital tract trauma at birth: a randomized trial. Journal of midwifery & women's health. 2005;50(5):365-72.
• Analsfinkterskador vid förlossning. Mölnlycke, Sweden: Statens beredning för social och medicinsk utvärdering, 2016. Disponível em: http://www.sbu.se/sv/publikationer/SBU-utvarderar/analsfinkterskador-vid-forlossning/. Acesso em: 27 sept 2017.
• Ankarcrona V, Karlstrom S, Sylvan S, et al.Episiotomy in vacuum extraction, do we cut the levator ani muscle? A prospective cohort study. Int Urogynecol J, Apr 25 2022.
• Annual report 2021 of the Swedish Pregnancy Register. Stockholm, Sweden 2022. Disponível em: https://www.medscinet.com/GR/uploads/hemsida/dokumentarkiv/Graviditetsregistrets%20Årsrapport%202021_1.0.pdf.
• Baghestan E, Irgens LM, Bordahl PE, Rasmussen S. Trends in risk factors for obstetric anal sphincter injuries in Norway. Obstet Gynecol 2010; 116: 25–34.
• Basu M, Smith D, Edwards R. Can the incidence of obstetric anal sphincter injury be reduced? The STOMP experience. European journal of obstetrics, gynecology, and reproductive biology. 2016;202:55-9.
• Basu M, Smith D. Long-term outcomes of the Stop Traumatic OASI Morbidity Project (STOMP). International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics. 2018;142(3):295-9.
• Beckmann, M. M., & Stock, O. M. (2014). Antenatal perineal massage for reducing perineal trauma-Cochrane Database of Systematic Reviews-ISBN: 1465-1858.
• Bergendahl S, Jonsson M, Hesselman S, Ankarcrona V, Leijonhufvud Å, Wihlbäck AC, Wallström T, Rydström E, Friberg H, Kopp Kallner H, Brismar Wendel S. Lateral episiotomy or no episiotomy in vacuum assisted delivery in nulliparous women (EVA): multicentre, open label, randomised controlled trial. BMJ. 2024 Jun 17;385:e079014. doi: 10.1136/bmj-2023-079014. PMID: 38886011.
• Bergendahl S, Lindberg P, Brismar Wendel S. Operator experience affects the risk of obstetric anal sphincter injury in vacuum extraction deliveries. Acta Obstet Gynecol Scand. 2019 Jun;98(6):787-794. doi: 10.1111/aogs.13538. Epub 2019 Feb 7. PMID: 30659578.
• Bonet M, Ota E, Chibueze CE, Oladapo OT. Antibiotic prophylaxis for episiotomy repair following vaginal birth. Cochrane Database Syst Rev. 2017 Nov 2;11(11):CD012136. doi: 10.1002/14651858.CD012136.pub2. PMID: 29096053; PMCID: PMC6485970.
• Bonet M, Ota E, Chibueze CE, Oladapo OT. Routine antibiotic prophylaxis after normal vaginal birth for reducing maternal infectious morbidity. Cochrane Database Syst Rev. 2017 Nov 13;11(11):CD012137. doi: 10.1002/14651858.CD012137.pub2. PMID: 29190037; PMCID: PMC6486135.
• Buppasiri P, Lumbiganon P, Thinkhamrop J, Thinkhamrop B. Antibiotic prophylaxis for third- and fourth-degree perineal tear during vaginal birth. Cochrane Database Syst Rev. 2014 Oct 7;2014(10):CD005125. doi: 10.1002/14651858.CD005125.pub4. PMID: 25289960; PMCID: PMC10542915.
• Coats PM, Chan KK, Wilkins M, et al. A comparison between midline and mediolateral episiotomies. Br J Obstet Gynaecol, 87, n. 5, p. 408-412, May 1980.
• Edqvist M, Hildingsson I, Mollberg M, et al. Midwives' Management during the Second Stage of Labor in Relation to Second-Degree Tears-An Experimental Study. Birth (Berkeley, Calif). 2016.
• Edqvist, Malin, et al. "The effect of two midwives during the second stage of labour to reduce severe perineal trauma (Oneplus): a multicentre, randomised controlled trial in Sweden." The Lancet10331 (2022): 1242-1253.
• Elvander C, Ahlberg M, Thies-Lagergren L, et al. Birth position and obstetric anal sphincter injury: a population-based study of 113 000 spontaneous births. BMC pregnancy and childbirth. 2015;15:252.
• Fodstad K, Staff AC, Laine K. Effect of different episiotomy techniques on perineal pain and sexual activity 3 months after delivery. Int Urogynecol J, 25, n. 12, p. 1629-1637, Dec 2014.
• Fodstad K, Staff AC, Laine K. Episiotomy preferences, indication, and classification--a survey among Nordic doctors. Acta Obstet Gynecol Scand, 95, n. 5, p. 587-595, May 2016a.
• Fodstad K, Staff AC, Laine K. Sexual activity and dyspareunia the first year postpartum in relation to degree of perineal trauma. Int Urogynecol J, 27, n. 10, p. 1513-1523, Oct 2016b.
• Ginath S, Elyashiv O, Weiner E, et al.The optimal angle of the mediolateral episiotomy at crowning of the head during labor. Int Urogynecol J, 28, n. 12, p. 1795-1799, Dec 2017.
• Gonzales-Dias E, Fernandez Fernandes C, Gonzalo Orden JM, et al. Which characteristics of the episiotomy and perineum are associated with a lower risk of obstetric anal sphincter injury in instrumental deliveries. Eur J Obstet Gynecol Reprod Biol, 233, p. 127-133, Feb 2019.
• Gottvall K, Allebeck P, Ekeus C. Risk factors for anal sphincter tears: the importance of maternal position at birth. BJOG : an international journal of obstetrics and gynaecology. 2007;114(10):1266-72.
• Gupta, J. K., Sood, A., Hofmeyr, G. J., & Vogel, J. P. (2017). Position in the second stage of labour for women without epidural anaesthesia. Cochrane database of systematic reviews, (5).
• Heitmann JA, Benrubi GI. Efficacy of prophylactic antibiotics for the prevention of endomyometritis after forceps delivery. Southern Medical Journal 1989;82:960‐
• https://lof.se/filer/Instrumentell-forlossning-med-sugklocka.pdf
• Humphreys ABC, Linsell L, Knight M. Factors associated with infection after operative vaginal birth-a secondary analysis of a randomized controlled trial of prophylactic antibiotics for the prevention of infection following operative vaginal birth. Am J Obstet Gynecol. 2023 Mar;228(3):328.e1-328.e11. doi: 10.1016/j.ajog.2022.08.037. Epub 2022 Aug 24. PMID: 36027955.
• Häggsgård, C., Nilsson, C., Teleman, P., Rubertsson, C., & Edqvist, M. (2022). Women’s experiences of the second stage of labour. Women and Birth, 35(5), e464-e470.
• Jiang H, Qian X, Carroli G, et al. Selective versus routine use of episiotomy for vaginal birth. Cochrane Database Syst Rev, 2, p. CD000081, Feb 8 2017.
• Jonsson ER, Elfaghi I, Rydhstrom H, et al. Modified Ritgen's maneuver for anal sphincter injury at delivery: a randomized controlled trial. Obstetrics and gynecology. 2008;112(2 Pt 1):212-7
• Kalis V, Laine K, de Leeuw JW, et al. Classification of episiotomy: towards a standardisation of terminology. BJOG, 119, n. 5, p. 522-526, Apr 2012.
• Karbanova J, Rusavy Z, Betincova L, et al.Clinical evaluation of peripartum outcomes of mediolateral versus lateral episiotomy. Int J Gynaecol Obstet, 124, n. 1, p. 72-76, Jan 2014.
• Knight M, Chiocchia V, Partlett C, Rivero-Arias O, Hua X, Hinshaw K, Tuffnell D, Linsell L, Juszczak E; ANODE collaborative group. Prophylactic antibiotics in the prevention of infection after operative vaginal delivery (ANODE): a multicentre randomised controlled trial. Lancet. 2019 Jun 15;393(10189):2395-2403. doi: 10.1016/S0140-6736(19)30773-1. Epub 2019 May 13. Erratum in: Lancet. 2019 Jun 15;393(10189):2394. PMID: 31097213; PMCID: PMC6584562
• Kok M, Pechère J. Nature and pathogenicity of micro‐ In: Armstrong D, Cohen J editor(s).Infectious Diseases. London: Mosby, 2000:1‐26. 
• Kopas, Mary Lou. "A review of evidence‐based practices for management of the second stage of labor."Journal of midwifery & women's health3 (2014): 264-276.
• Kotaska A, Campbell K. Two-step delivery may avoid shoulder dystocia: head-to-body delivery interval is less important than we think. Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstetrique et gynecologie du Canada : JOGC. 2014;36(8):716-20.
• Laine K, Rotvold W, Staff AC. Are obstetric anal sphincter ruptures preventable?-- large and consistent rupture rate variations between the Nordic countries and between delivery units in Norway. Acta obstetricia et gynecologica Scandinavica. 2013;92(1):94-100.
• Lemos A, Amorim MM, Dornelas de Andrade A, de Souza AI, Cabral Filho JE, Correia JB. Pushing/bearing down methods for the second stage of labour. The Cochrane database of systematic reviews 2017;3:Cd009124.
• Liabsuetrakul T, Choobun T, Peeyananjarassri K, et al. Antibiotic prophylaxis for operative vaginal delivery. Cochrane Database Syst Rev. 2020 Mar 26;3(3):CD004455. doi: 10.1002/14651858.CD004455.pub5. PMID: 32215906; PMCID: PMC7096725.
• Lindgren, H., Rehn, M. & Wiklund, I. (2019). Barnmorskans handläggning vid normal förlossning: forskning och erfarenhet. (Andra upplagan), Barnets framfödande(s. 71-80). Lund: Studentlitteratur.
• Lindgren, H., Rehn, M. & Wiklund, I. (2019). Barnmorskans handläggning vid normal förlossning: forskning och erfarenhet. (Andra upplagan). Lund: Studentlitteratur AB.
• Locatelli A, Incerti M, Ghidini A, Longoni A, Casarico G, Ferrini S, Strobelt N. Head-to-body delivery interval using 'two-step' approach in vaginal deliveries: effect on umbilical artery pH. J Matern Fetal Neonatal Med. 2011 Jun;24(6):799-803.
• Lund NS, et al. Episiotomy in vacuum-assisted delivery affects the risk of obstetric anal sphincter injury: a systematic review and meta-analysis. Eur J Obstet Gynecol Reprod Biol. 2016;207:193-9.
• Lund NS, Persson LK, Jango H, et al. Episiotomy in vacuum-assisted delivery affects the risk of obstetric anal sphincter injury: a systematic review and meta-analysis. Eur J Obstet Gynecol Reprod Biol, 207, p. 193-199, Dec 2016.
• Martin DL. The Protection of the Perineum by Episiotomy in Delivery at Term. Cal State J Med, 19, n. 6, p. 229-231, Jun 1921.
• Necesalova P, Karbanova J, Rusavy Z, et al.Mediolateral versus lateral episiotomy and their effect on postpartum coital activity and dyspareunia rate 3 and 6 months postpartum. Sex Reprod Healthc, 8, p. 25-30, Jun 2016.
• Nieuwenhuijze MJ, de Jonge A, Korstjens I, et al. Influence on birthing positions affects women's sense of control in second stage of labour. Midwifery. 2013;29(11):e107-14.
• Nordenstam J, Mellgren A, Altman D, López A, Johansson C, Anzén B, Li ZZ, Zetterström J. Immediate or delayed repair of obstetric anal sphincter tears-a randomised controlled trial. BJOG. 2008 Jun;115(7):857-65. doi: 10.1111/j.1471-0528.2008.01726.x. PMID: 18485164.
• Okeahialam NA, Wong KW, Jha S, Sultan AH, Thakar R. Mediolateral/lateral episiotomy with operative vaginal delivery and the risk reduction of obstetric anal sphincter injury (OASI): A systematic review and meta-analysis. Int Urogynecol J. 2022 Jun;33(6):1393-1405. doi: 10.1007/s00192-022-05145-1. Epub 2022 Apr 15. PMID: 35426490; PMCID: PMC9206628.
• Ould F. A Treatise on Midwifry: In Three Parts.  Buckland, 1748.
• Pergialiotis V, Bellos I, Fanaki M, Vrachnis N, Doumouchtsis SK. Risk factors for severe perineal trauma during childbirth: an updated metaanalysis. Eur J Obstet Gynecol Reprod Biol 2020;247:94–100.
• Pirhonen JP, Grenman SE, Haadem K, Gudmundsson S, Lindqvist P, Siihola S, et al. Frequency of anal sphincter rupture at delivery in Sweden and Finland--result of difference in manual help to the baby's head. Acta obstetricia et gynecologica Scandinavica. 1998;77(10):974-7.
• Prins M, Boxem J, Lucas C, Hutton E. Effect of spontaneous pushing versus Valsalva pushing in the second stage of labour on mother and fetus: a systematic review of randomised trials. BJOG : an international journal of obstetrics and gynaecology. 2011;118(6):662-70.
• Raisanen S, Vehvilainen-Julkunen K, Cartwright R, Gissler M, Heinonen S. A prior cesarean section and incidence of obstetric anal sphincter injury. Int Urogynecol J 2013; 24: 1331–39
• Rockner G, Fianu-Jonasson A. Changed pattern in the use of episiotomy in Sweden. Br J Obstet Gynaecol, 106, n. 2, p. 95-101, Feb 1999.
• Rotem R, Mastrolia SA, Rottenstreich M, Yohay D, Weintraub AY. The use of metronidazole in women undergoing obstetric anal sphincter injuries: a systematic review of the literature. Arch Gynecol Obstet. 2020 Aug;302(2):321-328. doi: 10.1007/s00404-020-05651-x. Epub 2020 Jun 20. PMID: 32564129.
• Rygh AB, Skjeldestad FE, Körner H, Eggebø TM. Assessing the association of oxytocin augmentation with obstetric anal sphincter injury in nulliparous women: a population-based, case-control study. BMJ Open. 2014 Jul 24;4(7):e004592. 
• Sagi-Dian L, Sagi S. Morbidity associated with episiotomy in vacuum delivery: a systematic review and meta-analysis. BJOG, 122, n. 8, p. 1073-1081, Jul 2015.
• Samuelsson E, Ladfors L, Lindblom BG, Hagberg H. A prospective observational study on tears during vaginal delivery: occurrences and risk factors. Acta obstetricia et gynecologica Scandinavica. 2002;81(1):44-9.
• Samuelsson E, Ladfors L, Wennerholm UB, Gareberg B, Nyberg K, Hagberg H. Anal sphincter tears: prospective study of obstetric risk factors. BJOG : an international journal of obstetrics and gynaecology. 2000;107(7):926-31.
• Smith LA, Price N, Simonite V, Burns EE. Incidence of and risk factors for perineal trauma: a prospective observational study. BMC pregnancy and childbirth. 2013;13:59.
• Stedenfeldt M, Pirhonen J, Blix E, et al.Episiotomy characteristics and risks for obstetric anal sphincter injuries: a case-control study. BJOG, 119, n. 6, p. 724-730, May 2012
• Tern H., Rubertsson C., Edqvist M., Ekelin M. Midwives’ experiences of professional learning when practicing collegial midwifery assistance during the active second stage of labour: Data from the Oneplus trial. BMC Pregnancy and Childbirth, 2024 24:287
• Tern, H., Rubertsson, C., Ekelin, M., Dahlen, H. G., Häggsgård, C., & Edqvist, M. (2024). Women’s experiences of being assisted by two midwives during the active second stage of labour: Secondary outcomes from the Oneplus trial. Sexual & Reproductive Healthcare, 39, 100926.
• Thies-Lagergren L, Kvist LJ, Christensson K, et al. No reduction in instrumental vaginal births and no increased risk for adverse perineal outcome in nulliparous women giving birth on a birth seat: results of a Swedish randomized controlled trial. BMC Pregnancy Childbirth 2011, 11:22.
• Thies-Lagergren L, Kvist LJ, Sandin-Bojö AK, et al. Labour augmentation and fetal outcomes in relation to birth positions: a secondary analysis of an RCT evaluating birth seat births. Midwifery 2013, 29(4):344-350.