 | Up a level |
Zumkeller, Natalia; Brenner, Hermann; Zwahlen, Marcel; Rothenbacher, Dietrich (2006). Helicobacter pylori infection and colorectal cancer risk: a meta-analysis. Helicobacter, 11(2), 75-80.. Cambridge, Mass.: Blackwell Science 10.1111/j.1523-5378.2006.00381.x
