title: The two-period cross-over clinical trial. 1979.
authors.forename: M
authors.initials: M
authors.lastname: Hills
authors.forename: P
authors.initials: P
authors.lastname: Armitage
mesh_terms: D002986:Clinical Trials as Topic / Q000266:history* / Q000379:methods; D018592:Cross-Over Studies; D003627:Data Interpretation, Statistical; D049673:History, 20th Century; D006801:Humans; D013223:Statistics as Topic / Q000266:history