Journal of Clinical EpidemiologyVolume 51, Issue 8, August 1998, Pages 637-641DiscussionAuthor links open overlay panelShow moreShareCitehttps://doi.org/10.1016/S0895-4356(98)00021-3Get rights and contentFirst page previewClick to open first page previewView PDFRecommended articlesReferences (0)Cited by (0)View full textCopyright © 1998 Published by Elsevier Inc.