?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Ford%2C+DJ&rft.aufirst=DJ&rft.aulast=Ford&rft.atitle=The+impact+of+different+CD4+monitoring+and+switching+strategies+on+mortality+in+HIV-infected+African+adults+on+antiretroviral+therapy%3B+an+application+of+dynamic+marginal+structural+models&rft.volume=182&rft.date=26+August+2015&rft.issue=7&rft.title=American+Journal+of+Epidemiology&rft.genre=article