Active Helicobacter pylori Infection Is a Risk Factor for Colorectal Mucosa: Early and Advanced Colonic Neoplasm Sequence oleh Jannis Kountouras, Nikolaos Kapetanakis, Stergios A. Polyzos, Panagiotis Katsinelos, Emmanuel Gavalas, Dimitri Tzivras, Christos Zeglinas, Constantinos Kountouras, Elizabeth Vardaka, Eyripidis Stefanidis, Evagelos Kazakos