Correction: A Global Overview of the Genetic and Functional Diversity in the Helicobacter pylori cag Pathogenicity Island

• Patrick Olbermann, 
• Christine Josenhans, 
• Yoshan Moodley, 
• Markus Uhr, 
• Christiana Stamer, 
• Marc Vauterin, 
• Sebastian Suerbaum, 
• Mark Achtman, 
• Bodo Linz