We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleTracking inner city substance users from the emergency department: how many contacts does it take?AuthorsCunningham, Rebecca; Walton, Maureen A; Tripathi, Shanti P; Outman, Ryan; Murray, Regan; Booth, Brenda MAbstractLongitudinal studies of substance users report difficulty in locating and completing 12-month interviews, which may compromise study validity.PublicationAcademic emergency medicine : official journal of the Society for Academic Emergency Medicine, 2008, Vol 15, Issue 2, p136ISSN1553-2712Publication typeJournal ArticleDOI10.1111/j.1553-2712.2008.00033.x