© 2007 by The Society for Healthcare Epidemiology of America. Publisher PDF posted after a 12-month embargo as allowed by the publisher's author rights policy at http://www.press.uchicago.edu/journals/jrnl_rights.html.
Except where otherwise noted, this item's license is described as © 2007 by The Society for Healthcare Epidemiology of America. Publisher PDF posted after a 12-month embargo as allowed by the publisher's author rights policy at http://www.press.uchicago.edu/journals/jrnl_rights.html.