Drupal-Bibcite31<style face="normal" font="default" size="100%">Proton pump inhibitors and histamine-2-receptor antagonists and pancreatic cancer risk: a nested case-control study</style><style face="normal" font="default" size="100%">Proton pump inhibitors and histamine-2-receptor antagonists and pancreatic cancer risk: a nested case-control study</style>