APracticalGuidetoUsingQualitativeResearchwithRandomizedControlledTrials1APracticalGuidetoUsingQualitativeResearchwithRandomizedControlledTrialsAliciaO’CathainProfessorofHealthServicesResearchSchoolofHealthandRelatedResearch(ScHARR)UniversityofSheffield,Sheffield,UK1GreatClarendonStreet,Oxford,OX26DP,UnitedKingdomOxfordUniversityPressisadepartmentoftheUniversityofOxford.ItfurtherstheUniversity’sobjectiveofexcellenceinresearch,scholarship,andeducationbypublishingworldwide.OxfordisaregisteredtrademarkofOxfordUniversityPressintheUKandincertainothercountries©OxfordUniversityPress2018ThemoralrightsoftheauthorhavebeenassertedFirstEditionpublishedin2018Impression:1Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmitted,inanyformorbyanymeans,withoutthepriorpermissioninwritingofOxfordUniversityPress,orasexpresslypermittedbylaw,bylicenceorundertermsagreedwiththeappropriatereprographicsrightsorganization.EnquiriesconcerningreproductionoutsidethescopeoftheaboveshouldbesenttotheRightsDepartment,OxfordUniversityPress,attheaddressaboveYoumustnotcirculatethisworkinanyotherformandyoumustimposethissameconditiononanyacquirerPublishedintheUnitedStatesofAmericabyOxfordUniversityPress198MadisonAvenue,NewYork,NY10016,UnitedStatesofAmericaBritishLibraryCataloguinginPublicationDataDataavailableLibraryofCongressControlNumber:2017959068ISBN978–0–19–880208–2PrintedandboundbyCPIGroup(UK)Ltd,Croydon,CR04YYOxfordUniversityPressmakesnorepresentation,expressorimplied,thatthedrugdosagesinthisbookarecorrect.Readersmustthereforealwayschecktheproductinformationandclinicalprocedureswiththemostup-to-datepublishedproductinformationanddatasheetsprovidedbythemanufacturersandthemostrecentcodesofconductandsafetyregulations.Theauthorsandthepublishersdonotacceptresponsibilityorlegalliabilityforanyerrorsinthetextorforthemisuseormisapplicationofmaterialinthiswork.Exceptwhereotherwisestated,drugdosagesandrecommendationsareforthenon-pregnantadultwhoisnotbreast-feedin...