1. Chief of Service, Department of General Surgery, Ciudad Sanitaria de la Jose Antonio, Avenida Isabel la Catolica, S/N, Zaragoza, Spain
2. Chief of Section, Department of General Surgery, Ciudad Sanitaria de la Jose Antonio, Avenida Isabel la Catolica, S/N, Zaragoza, Spain
3. Chief of Department, Department of General Surgery, Ciudad Sanitaria de la Jose Antonio, Avenida Isabel la Catolica, S/N, Zaragoza, Spain