Technical essential aspects in robotic colorectal surgery: mastering the Da Vinci Si and Xi platforms oleh ANDRE LUIZ GIOIA MORRELL, ALEXANDER CHARLES MORRELL-JUNIOR, ALLAN GIOIA MORRELL, ELIAS COUTO ALMEIDA-FILHO, DUARTE MIGUEL FERREIRA RODRIGUES RIBEIRO, GLADIS MARIA PACILEO ANCHIETA RODRIGUES RIBEIRO, FRANCISCO TUSTUMI, JOSE MAURICIO FREITAS MENDES, ALEXANDER CHARLES MORRELL