Exogenous sex steroid hormones and asthma in females: protocol for a population-based retrospective cohort study using a UK primary care database.
Bright I NwaruColin R SimpsonIreneous N SoyiriRebecca PillingerFrancis AppiagyeiDermot RyanHilary CritchleyDavid J PriceCatherine M HawrylowiczAziz SheikhPublished in: BMJ open (2018)
EUPAS22967.