Methotrexate use among men-association with fertility and the perinatal health of their children: a Swedish nationwide register study
OBJECTIVE: To study the effect of methotrexate on male fertility and subsequent effects on their children, for which data are scarce and contradictory.DESIGN: Nationwide multiregister cohort study.SETTING: Not applicable.SUBJECT(S): All children born alive in Sweden between 2006 and 2014 and their fathers. Three cohorts were defined: children to fathers with periconceptional methotrexate exposure
