1726-6718 1726-6718 S1726-67182021000200002 Cuba 00 08 2021 00 08 2021 20 2 1 2015 3 13-20 2 International Surgical Outcomes Study group 2016 117 601-9 3 2012 380 1059-65 4 2019 54 13-8 5 2007 3 5 5 519-28 6 2019 40 614-28 7 2018 121 2 2 344-9 8 2016 354 994-9 9 2004 5 407-41 10 2016 26 432-43 11 2017 2 121-9 12 2001 182 449-54 13 2018 71 2 2 2498-504 14 2019 9 15 2017 99 11 11 914-22 16 2018 12 17 2020 124 5 5 623-37 18 2018 32 168-77 19 2017 7 20 2018 6 21 2015 59 248-54 22 2018 68 502-11 23 2017 9 24 2018 13 6 6 25 2015 17 10 10 334-40 26 2015 32 477-85 27 2019 122 3 3 361-9 28 2016 212 831-6 29 2018 83 501-7 30 2015 8 31 2016 1-6 32 2019 27 33 2017 17 184 184 9 34 2017 25 35 2017 31 32-6 36 2019 1-8 37 2019 5 e449 e449 1-9 38 2018 1-10 39 2019 128 5 5 918-23