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Predictive ultrasound factors of lymphatic invasion in rectal cancer: "extra-corporeal" studyRamírez-Rodríguez, José Manuel; Palacios-Fanlo, María José; Ortego-Fernández-de-Retana, Javier; Aguilella-Diago, Vicente; Martínez-Díez, Mariano · Revista Española de Enfermedades Digestivas · 2011