text_1: There is a relation between Erythromycin use and hypertrophic pyloric stenosis.
text_2: PARTICIPANTS 999,378 liveborn singletons and linked individual level information on macrolide prescriptions (maternal use during pregnancy, n=30,091; maternal use after birth, n=21,557; use in infants, n=6591), surgery for IHPS, and potential confounders.