Retrospective vs. Prospective Coital Frequency and Menstrual Cycle Length in a Contraceptive Effectiveness Trial
2001 ◽
Vol 11
(6)
◽
pp. 428-433
◽
Keyword(s):
1998 ◽
Vol 64
(5)
◽
pp. 299-312
Keyword(s):
Keyword(s):
Keyword(s):