2011-7582 2011-7582 S2011-75822020000200162 10.30944/20117582.616 Colombia Colombia Colombia Colombia Colombia Colombia Colombia Colombia Colombia Colombia Colombia Colombia Colombia 00 06 2020 00 06 2020 35 2 162 170 American College of Surgeons 2020 American society of clinical oncology 2020 Asociación española de cirujanos 2020 2020 2020 21 335-7 2020 42 2020 2020