Contraceptive failure related to estimated cycle day of conception relative to the start of the last bleeding episode☆
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☆ This research was supported by the Vancouver Foundation through a BC Medical Services Foundation grant to the Community Based Clinical Investigator (CBCI) Program at UBC's Department of Family Practice.
PII: S0010-7824(08)00485-X
doi:10.1016/j.contraception.2008.10.004
© 2009 Elsevier Inc. All rights reserved.
