1 Escuela de Medicina, Universidad San Francisco de Quito (USFQ), Department of General Surgery at Hospital Iess Quito Sur, Quito, Ecuador.
2 Hospital Padre Carollo "Un Canto a la Vida", Grupo Digeslap Center, Quito, Ecuador.
3 Escuela de Medicina, Pontificia Universidad Católica del Ecuador (PUCE), Department of General Surgery at Hospital General San Francisco Iess, Quito, Ecuador.
4 Escuela de Medicina, Pontificia Universidad Católica del Ecuador (PUCE), Clinica Integral, Quito, Ecuador.
5 Department of General Surgery at Hospital Iess Quito Sur, Quito, Ecuador.
6 Department of General Surgery, Division of Cardiothoracic Surgery, Hospital Metropolitano, Quito, Ecuador.