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http://journals.cambridge.org/action/displayAbstract?aid=445870
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TARA M. SULLIVAN,
JANE T. BERTRAND,
JANET RICE
and JAMES D. SHELTON
(2006).
SKEWED CONTRACEPTIVE METHOD MIX: WHY IT HAPPENS, WHY IT MATTERS. Journal of Biosocial Science, 38
,
pp 501-521
doi:10.1017/S0021932005026647