EHR= electronic health records, HR= adjust hazard ratio, CI= confidence interval, Ref.= referent group
A-STO: comparing the effect of two Antibiotics on a short-term outcome
A-LTO: comparing the effect of two Antibiotics effect on a long-term outcome
GN-LTO: Comparing the effect of a Gastroprotective agent vs. non-use on a long-term outcome
GG-LTO: Comparing the effect of two Gastroprotective agents on a long-term outcome