Background/Aims: Proton pump inhibitors (PPIs) are widely used to treat several acid-related gastrointestinal disorders. This study aimed investigate the risk of dementia in patients taking PPIs.Materials and Methods: A systematic review was conducted evaluate correlation between PPIs dementia. The methodological quality included studies evaluated using Risk Bias Assessment tool for non-randomi...

We extend the approach to representation of partial information based on orderings on objects from sets to multisets. We characterize orderings arising under closed-and open-world assumptions and analyze their complexity. In contrast to the set case, where orderings are rst-order deenable and are thus expressible in standard database query languages, the orderings on bags are not expressible in...

We extend the approach to representation of partial information based on orderings on objects from sets to multisets. We characterize orderings arising under the closed-and the open-world assumptions and analyze their complexity. We prove that, in contrast to the set case, where orderings are rst-order deenable and are thus expressible in standard database query languages, the orderings on bags...