Exogenous sex steroid hormones and asthma in females : protocol for a population-based retrospective cohort study using a UK primary care database
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Nwaru , B I , Simpson , C R , Soyiri , I N , Pillinger , R , Appiagyei , F , Ryan , D , Critchley , H , Price , D B , Hawrylowicz , C M & Sheikh , A 2018 , ' Exogenous sex steroid hormones and asthma in females : protocol for a population-based retrospective cohort study using a UK primary care database ' BMJ Open , vol. 8 , no. 6 , e020075 , pp. 1-5 . https://doi.org/10.1136/bmjopen-2017-020075
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