{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T19:59:16Z","timestamp":1792007956817,"version":"4.4.0"},"reference-count":23,"publisher":"Elsevier BV","issue":"6","license":[{"start":{"date-parts":[[2013,6,1]],"date-time":"2013-06-01T00:00:00Z","timestamp":1370044800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Contraception"],"published-print":{"date-parts":[[2013,6]]},"DOI":"10.1016\/j.contraception.2012.12.006","type":"journal-article","created":{"date-parts":[[2012,12,19]],"date-time":"2012-12-19T18:50:46Z","timestamp":1355943046000},"page":"732-737","source":"Crossref","is-referenced-by-count":10,"title":["Comparison of serum and cervical mucus hormone levels during hormone-free interval of 24\/4 vs. 21\/7 combined oral contraceptives"],"prefix":"10.1016","volume":"87","author":[{"given":"Heather","family":"Fels","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachel","family":"Steward","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander","family":"Melamed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Granat","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank Z.","family":"Stanczyk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"suffix":"Jr.","given":"Daniel R.","family":"Mishell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"issue":"29","key":"10.1016\/j.contraception.2012.12.006_bb0005","article-title":"Use of contraception in the United States: 1982\u20132008. National Center for Health Statistics.","volume":"23","author":"Mosher","year":"2010","journal-title":"Vital Health Stat"},{"key":"10.1016\/j.contraception.2012.12.006_bb0010","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1016\/j.contraception.2004.05.006","article-title":"Ovarian follicular development is initiated during the hormone-free interval of oral contraceptive use","volume":"70","author":"Baerwald","year":"2004","journal-title":"Contraception"},{"issue":"6","key":"10.1016\/j.contraception.2012.12.006_bb0015","doi-asserted-by":"crossref","first-page":"1205","DOI":"10.1097\/AOG.0b013e3181beab47","article-title":"Cycle control with a 21-day compared with a 24-day oral contraceptive pill: a randomized controlled trial","volume":"114","author":"Kaunitz","year":"2009","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.contraception.2012.12.006_bb0020","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1016\/j.contraception.2006.08.004","article-title":"Efficacy and safety of a new 24-day oral contraceptive regimen of norethindrone acetate 1 mg\/ethinyl estradiol 20 microgram (Loestrin 24 Fe)","volume":"75","author":"Nakajima","year":"2007","journal-title":"Contraception"},{"issue":"1","key":"10.1016\/j.contraception.2012.12.006_bb0025","doi-asserted-by":"crossref","first-page":"18","DOI":"10.1016\/S0002-9378(98)70292-3","article-title":"Ovarian activity in women taking an oral contraceptive containing 20 \u03bcg ethinyl estradiol and 150 \u03bcg desogestrel: effects of low estrogen doses during the hormone-free interval","volume":"179","author":"Killick","year":"1998","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.contraception.2012.12.006_bb0030","doi-asserted-by":"crossref","first-page":"100","DOI":"10.1016\/j.contraception.2006.02.006","article-title":"Greater inhibition of the pituitary-ovarian axis in oral contraceptive regimens with a shortened hormone-free interval","volume":"74","author":"Willis","year":"2006","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0035","first-page":"33","article-title":"Effectiveness of oral contraceptive pills in a large U.S. cohort comparing progestogen and regimen","volume":"117","author":"Dinger","year":"2011","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0040","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1016\/j.contraception.2008.10.005","article-title":"Follicular development in a 7-day versus 4-day hormone-free interval with an oral contraceptive containing 20 mcg ethinyl estradiol and 1 mg norethindrone acetate","volume":"79","author":"Rible","year":"2009","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0045","first-page":"4","article-title":"U.S. Medical Eligibility Criteria for Contraceptive Use, 2010","volume":"59","author":"Centers for Disease Control and Prevention","year":"2010","journal-title":"MMWR Early Release"},{"key":"10.1016\/j.contraception.2012.12.006_bb0050","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1016\/S0010-7824(02)00351-7","article-title":"Quick start: novel oral contraceptive initiation method","volume":"66","author":"Westhoff","year":"2002","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0055","doi-asserted-by":"crossref","first-page":"1400","DOI":"10.1016\/S0002-9378(11)90772-8","article-title":"Single and multiple dose pharmacokinetics of a low dose oral contraceptive in women with chronic renal failure on peritoneal dialysis","volume":"168","author":"Price","year":"1993","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.contraception.2012.12.006_bb0060","doi-asserted-by":"crossref","first-page":"457","DOI":"10.1016\/0010-7824(80)90099-2","article-title":"Radioimmunoassay of plasma ethinylestradiol in the presence of circulating norethindrone","volume":"22","author":"Stanczyk","year":"1980","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0065","series-title":"WHO laboratory manual for the examination of human semen and sperm-cervical mucus interaction","author":"World Health Organization","year":"1999"},{"key":"10.1016\/j.contraception.2012.12.006_bb0070","doi-asserted-by":"crossref","first-page":"119","DOI":"10.1016\/j.contraception.2009.04.011","article-title":"Impact of obesity on oral contraceptive pharmacokinetics and hypothalamic-pituitary-ovarian activity","volume":"80","author":"Edelman","year":"2009","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0075","doi-asserted-by":"crossref","first-page":"474","DOI":"10.1016\/j.contraception.2010.01.016","article-title":"Pharmacokinetics of a combined oral contraceptive in obese and normal-weight women","volume":"81","author":"Westoff","year":"2010","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0080","doi-asserted-by":"crossref","first-page":"S53","DOI":"10.1016\/S0002-9378(99)70364-9","article-title":"The effects on ovarian activity of a monophasic oral contraceptive with 100 \u03bcg levonorgestrel and 20 \u03bcg ethinyl estradiol","volume":"181","author":"Coney","year":"1999","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.contraception.2012.12.006_bb0085","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1016\/S0015-0282(03)00556-9","article-title":"Ortho Evra\u2122\/Evra\u2122 versus oral contraceptives: follicular development and ovulation in normal cycles and after an intentional dosing error. Ortho Evra\u2122\/Evra\u2122 008 Study Group","volume":"80","author":"Pierson","year":"2003","journal-title":"Fertil Steril"},{"issue":"2","key":"10.1016\/j.contraception.2012.12.006_bb0090","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1016\/0010-7824(96)00137-0","article-title":"Shorter pill-free interval in combined oral contraceptives decreases follicular development","volume":"54","author":"Spona","year":"1996","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0095","doi-asserted-by":"crossref","first-page":"357","DOI":"10.1016\/0010-7824(95)00228-6","article-title":"Ovarian activity suppression by two different low-dose triphasic oral contraceptives","volume":"52","author":"van der Does","year":"1995","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0100","first-page":"29","article-title":"Ovulation and follicular development associated with three low-dose oral contraceptives: a randomized controlled trial","volume":"83","author":"Grimes","year":"1994","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.contraception.2012.12.006_bb0105","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1016\/0010-7824(95)00096-S","article-title":"Ovarian function during low-dose oral contraceptive use","volume":"51","author":"Egarter","year":"1995","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0110","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1016\/j.contraception.2008.02.019","article-title":"Suppression of ovarian activity with a drospirenone-containing oral contraceptive in a 24\/4 regimen","volume":"78","author":"Klipping","year":"2008","journal-title":"Contraception"},{"key":"10.1016\/j.contraception.2012.12.006_bb0115","doi-asserted-by":"crossref","first-page":"583","DOI":"10.1016\/0010-7824(93)90025-3","article-title":"Ultrasound evaluation of ovarian activity under oral contraceptives","volume":"47","author":"Hoogland","year":"1993","journal-title":"Contraception"}],"container-title":["Contraception"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0010782412010372?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0010782412010372?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2018,10,20]],"date-time":"2018-10-20T00:03:36Z","timestamp":1539993816000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0010782412010372"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,6]]},"references-count":23,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2013,6]]}},"alternative-id":["S0010782412010372"],"URL":"https:\/\/doi.org\/10.1016\/j.contraception.2012.12.006","relation":{},"ISSN":["0010-7824"],"issn-type":[{"value":"0010-7824","type":"print"}],"subject":[],"published":{"date-parts":[[2013,6]]}}}