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Participant characteristics associated with withdrawal from a large randomized trial of spermicide effectiveness.
Raymond EG, Chen PL, Pierre-Louis B, Luoto J, Barnhart KT, Bradley L, Creinin MD, Poindexter A, Wan L, Martens M, Schenken R, Nicholas CF, Blackwell R
BMC Med Res Methodol 2004 Oct 1, 4:23
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