To estimate the relative risk of uncomplicated symptomatic peptic ulcer (UPU) associated with use of low dose aspirin (ASA) and other anti-inflammatory drugs (NSAIDs, steroids) in the general population To estimate the dose-response and duration-response associated with use of these drugs To estimate the relative risk of UPU associated with naive/non-naive use of low dose ASA in the general population To evaluate the effect of proton pump inhibitors (PPI) (alone or in combination with anti-inflammatory drugs) on the occurrence of UPU in the general population To investigate the management of low dose ASA/oral antiplatelets after UPU