40 Chapter 2 Author Year Journal Country Design *1 Study duration FU > 0.5y Anomaly WI WD AL PoP FD G. RamosGonzalez 2019 Journal of Pediatric Surgery USA RCS 1991-2016 Yes Biliary atresia 3 / 81 X X X X X. Ren 2018 Journal of laparoendoscopy China RCS 2005-2016 Yes ARM 0 / 25 X X X X X. Ren 2019 Pediatric surgery international China RCS 2011-2016 Yes ARM 2 / 48 X X X X D. Rocourt 2019 Journal of Pediatric Surgery USA RCS 2004-2016 Yes ARM 1/ 63 1 / 63 X X X H. Ryu 2019 Annals of Surgery Treatment and research South Korea RCS 2001-2018 No Choledochal cyst 0 / 43 X X X X T. Sakaguchi 2019 World journal of Pediatric Surgery Japan RCS 1995-2004 No ARM 2 / 39 X X X X S. Sato 1998 Journal of pediatric surgery Japan RCS 1970-1997 No Small intestinal atresia X X 4 / 88 X X R. Sola 2018 Pediatric surgery International USA RCS 1999-2016 No Hirschsprung's disease 4 / 100 X X X X J. Stanger 2014 Journal of pediatric surgery Canada RCS 2005-2011 Yes Gastroschisis 22 / 372 X X X X H. Xiao 2018 Journal of laparoendoscopy China RCS 2010-2014 Yes ARM 0 / 105 0 / 105 X X X Y. Yousef 2015 Journal of pediatric surgery Canada RCS 1988-2013 Yes Congenital diafragmatic hernia 1 / 14 X X X X T. Zhu 2019 International Journal of Colorectal Disease China RCS 2010-2015 Yes Hirschsprung's disease X X 4 / 157 X X T. Sholadoye 2018 African Journal of Paediatric Surgery Nigeria RCS 2005-2014 Yes Small intestinal atresia 6 / 38 3 / 38 2 / 38 X X *1 RCS = retrospective cohort study PCS = prospective cohort study RCT = randomized controlled trial
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