“…28 We ascertained current use (defined as at least one redeemed prescription within 90 days of the current hospitalisation) of histamine-2 receptor antagonists, prostaglandin analogues, proton pump inhibitors, non-steroidal anti-inflammatory drugs (NSA-IDs), systemic glucocorticoids, acetaminophen, aspirin, vitamin-K antagonists, antidepressants and antipsychotic drugs (for specific Anatomical Therapeutic Chemical classification system codes, see Appendix S1). 32,[35][36][37][38][39][40] Mortality data We followed patients from date of hospital admission with peptic ulcer bleeding until death, emigration, or up to 90 days or end of study, whichever came first. Data on all-cause mortality were obtained from the Danish Civil Registration System, which contains records of changes in migration and vital status for the entire Danish population since 1968, electronically updated on a daily basis.…”