[1] Univ Los Andes, Residente Coloproctol, Santiago, Chile
[2] Hosp Clin Magallanes, Punta Arenas, Chile
[3] Univ Chile, Residente Coloproctol, Santiago, Chile
[4] Univ Finis Terrae, Escuela Med, Santiago, Chile
[5] Univ Los Andes, Residente Cirugia Gen, Santiago, Chile
[6] Hosp Clin Eloisa Diaz Insunza La Florida, Santiago, Chile