?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Skaaby&rft.au=Skaaby%2C+T&rft.aufirst=T&rft.date=22+May+2017&rft.atitle=Investigating+the+causal+effect+of+smoking+on+hay+fever+and+asthma%3A+a+Mendelian+randomization+meta-analysis+in+the+CARTA+consortium&rft.volume=7&rft.title=Scientific+Reports&rft.issn=2045-2322&rft.genre=article