We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleValidity and reliability of retrospective assessment of disease activity and flare in observational cohorts of lupus patients.AuthorsFitzGerald JD; Grossman JMPublicationLupus, 1999, Vol 8, Issue 8, p638ISSN0961-2033Publication typearticleDOI10.1191/096120399680411443