I. Duijkers

Most-cited papers

1. Single dose pharmacokinetics and effects on follicular growth and serum hormones of a long-acting recombinant FSH preparation (FSH-CTP) in healthy pituitary-suppressed females.

   I. Duijkers, C. Klipping, P. Boerrigter, C. Machielsen +2 more

   2002Human Reproduction116 citations Open access

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2. Suppression of ovarian activity with a drospirenone-containing oral contraceptive in a 24/4 regimen.

   C. Klipping, I. Duijkers, D. Trummer, J. Marr

   2008Contraception107 citations

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3. Single and multiple dose pharmacokinetics and pharmacodynamics of the gonadotrophin-releasing hormone antagonist Cetrorelix in healthy female volunteers.

   I. Duijkers, C. Klipping, W. Willemsen, D. Krone +3 more

   1998Human Reproduction103 citations Open access

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4. Evaluation of the effect of a new oral contraceptive containing estetrol and drospirenone on hemostasis parameters.

   J. Douxfils, C. Klipping, I. Duijkers, V. Kinet +5 more

   2020Contraception97 citations Open access

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5. Endocrine and metabolic effects of an oral contraceptive containing estetrol and drospirenone.

   C. Klipping, I. Duijkers, M. Mawet, Catherine Maillard +3 more

   2021Contraception89 citations Open access

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6. Hemostatic Effects of a Novel Estradiol-Based Oral Contraceptive

   C. Klipping, I. Duijkers, S. Parke, U. Mellinger +2 more

   2011Drugs in R&D88 citations Open access

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7. Maintenance of ovulation inhibition with the 75-microg desogestrel-only contraceptive pill (Cerazette) after scheduled 12-h delays in tablet intake.

   T. Korver, C. Klipping, D. Heger-Mahn, I. Duijkers +2 more

   2005Contraception83 citations

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8. Reduced hemostatic effects with drospirenone-based oral contraceptives containing estetrol vs. ethinyl estradiol.

   C. Kluft, Y. Zimmerman, M. Mawet, C. Klipping +4 more

   2017Contraception81 citations Open access

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9. Ovulation inhibition with four variations of a four-phasic estradiol valerate/dienogest combined oral contraceptive: results of two prospective, randomized, open-label studies.

   J. Endrikat, S. Parke, D. Trummer, W. Schmidt +2 more

   2008Contraception81 citations Open access

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10. A prospective, randomized, pharmacodynamic study of quick-starting a desogestrel progestin-only pill following ulipristal acetate for emergency contraception.

    V. Brache, Leila Cochón, I. Duijkers, D. Levy +4 more

    2015Human Reproduction74 citations Open access

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11. Ovulation‐Inhibiting Effects of Dienogest in a Randomized, Dose‐Controlled Pharmacodynamic Trial of Healthy Women

    C. Klipping, I. Duijkers, A. Remmers, T. Faustmann +3 more

    2012Journal of clinical pharmacology73 citations

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12. A randomised study comparing the effect on ovarian activity of a progestogen-only pill (POP) containing desogestrel and a new POP containing drospirenone in a 24/4 regimen

    I. Duijkers, D. Heger-Mahn, D. Drouin, S. Skouby

    2015European journal of contraception & reproductive health care67 citations

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13. Polycystic ovaries, as defined by the 2003 Rotterdam consensus criteria, are found to be very common in young healthy women.

    I. Duijkers, C. Klipping

    2010Gynecological Endocrinology67 citations

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14. Maintenance of ovulation inhibition with a new progestogen-only pill containing drospirenone after scheduled 24-h delays in pill intake.

    I. Duijkers, D. Heger-Mahn, D. Drouin, E. Colli +1 more

    2016Contraception63 citations

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15. Inhibition of ovulation by administration of estetrol in combination with drospirenone or levonorgestrel: Results of a phase II dose-finding pilot study

    I. Duijkers, C. Klipping, Y. Zimmerman, N. Appels +5 more

    2015European journal of contraception & reproductive health care54 citations Open access

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16. Effects of a monophasic combined oral contraceptive containing nomegestrol acetate and 17β-oestradiol on ovarian function in comparison to a monophasic combined oral contraceptive containing drospirenone and ethinylestradiol

    I. Duijkers, C. Klipping, P. Grob, T. Korver

    2010European journal of contraception & reproductive health care53 citations

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17. The combined contraceptive vaginal ring and bone mineral density in healthy pre-menopausal women.

    R. Massai, L. Mäkäräinen, A. Kuukankorpi, C. Klipping +2 more

    2005Human Reproduction51 citations

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18. Ovarian function with the contraceptive vaginal ring or an oral contraceptive: a randomized study.

    I. Duijkers, C. Klipping, C. Verhoeven, T. Dieben

    2004Human Reproduction49 citations Open access

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19. A comparative study on the effects of a contraceptive vaginal ring NuvaRing® and an oral contraceptive on carbohydrate metabolism and adrenal and thyroid function

    I. Duijkers, S. Killick, A. Bigrigg, T. Dieben

    2004European journal of contraception & reproductive health care47 citations

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20. Pharmacodynamic effects and plasma pharmacokinetics of single doses of cetrorelix acetate in healthy premenopausal women.

    K. Erb, C. Klipping, I. Duijkers, B. Pechstein +2 more

    2001Fertility and Sterility41 citations Open access

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21. Standing page.indd

    C. Klipping, I. Duijkers, Michel P. Fortier, J. Marr +2 more

    201138 citations

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22. Long-term tolerability of ethinylestradiol 20 µg/drospirenone 3 mg in a flexible extended regimen: results from a randomised, controlled, multicentre study

    C. Klipping, I. Duijkers, Michel P. Fortier, J. Marr +2 more

    2012Journal of family planning and reproductive health care33 citations Open access

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23. Effects of an oral contraceptive containing estetrol and drospirenone on ovarian function.

    I. Duijkers, C. Klipping, V. Kinet, M. Jost +2 more

    2021Contraception28 citations Open access

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24. Pharmacodynamic study of four oral dosages of dienogest

    C. Klipping, I. Duijkers, T. Faustmann, S. Klein +1 more

    201027 citations Open access

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25. Effect on endometrial histology and pharmacokinetics of different dose regimens of progesterone vaginal pessaries, in comparison with progesterone vaginal gel and placebo

    I. Duijkers, I. Klingmann, R. Prinz, M. Wargenau +3 more

    2018Human Reproduction24 citations Open access

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26. Pituitary, ovarian and additional contraceptive effects of an estradiol-based combined oral contraceptive: results of a randomized, open-label study.

    J. Endrikat, S. Parke, D. Trummer, M. Serrani +2 more

    2013Contraception21 citations

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27. Length of the menstrual cycle after discontinuation of oral contraceptives

    I. Duijkers, Lonneke Engels, C. Klipping

    2005Gynecological Endocrinology21 citations

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28. Follicular fluid hormone concentrations after ovarian stimulation using gonadotropin preparations with different FSH/LH ratios. II. Comparison of hMG and recombinant FSH.

    I. Duijkers, W. Willemsen, H. M. Hollanders, C. Hamilton +2 more

    1997International journal of fertility and women's medicine20 citations

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29. A new fully human recombinant FSH (follitropin epsilon): two phase I randomized placebo and comparator-controlled pharmacokinetic and pharmacodynamic trials

    Khalid Abd-Elaziz, I. Duijkers, Lars Stöckl, B. Dietrich +3 more

    2017Human Reproduction19 citations Open access

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30. Different follicle stimulating hormone/luteinizing hormone ratios for ovarian stimulation.

    I. Duijkers, H. Vemer, J. Hollanders, W. Willemsen +4 more

    1993Human Reproduction19 citations

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31. Bioequivalence and X-Ray Visibility of a Radiopaque Etonogestrel Implant versus a Non-Radiopaque Implant

    P. Schnabel, G. Merki-Feld, Alice Malvy, I. Duijkers +2 more

    2012Clinical drug investigation14 citations

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32. One, two or three: how many directions are useful in transvaginal ultrasound measurement of ovarian follicles?

    I. Duijkers, L. Louwé, D. Braat, C. Klipping

    2004European Journal of Obstetrics, Gynecology, and Reproductive Biology13 citations

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33. Pharmacodynamics and pharmacokinetics after repeated subcutaneous administration of three gonadotrophin preparations.

    I. Duijkers, C. Klipping, T. Mulders, H. Out +2 more

    1997Human Reproduction12 citations Open access

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34. The effects on ovarian activity of delaying versus immediately restarting combined oral contraception after missing three pills and taking ulipristal acetate 30 mg.

    Camille Banh, T. Rautenberg, I. Duijkers, Pascale Borenzstein +5 more

    2020Contraception11 citations

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35. Oral follicle-stimulating hormone agonist tested in healthy young women of reproductive age failed to demonstrate effect on follicular development but affected thyroid function.

    M. Gerrits, Hester Kramer, R. El Galta, Geertje van Beerendonk +5 more

    2016Fertility and Sterility11 citations Open access

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36. Polycystic ovaries, as defined by the 2003 Rotterdam consensus criteria, are found to be very common in young healthy women

    I. Duijkers, C. Klipping

    201011 citations

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37. Follicular growth during contraceptive pill or vaginal ring treatment depends on the day of ovulation in the pretreatment cycle.

    I. Duijkers, C. Verhoeven, T. Dieben, C. Klipping

    2004Human Reproduction11 citations Open access

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38. Effect on ovarian activity and ovulation inhibition of different oral dosages of levonorgestrel.

    I. Duijkers, C. Klipping, T. Rautenberg, B. Schug +3 more

    2022Contraception10 citations

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39. Ultrasonographic assessment of endocervix and cervical mucus in ovulatory menstrual cycles.

    I. Duijkers, C. Klipping

    2000European Journal of Obstetrics, Gynecology, and Reproductive Biology10 citations

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40. Phase II dose-finding study on ovulation inhibition and cycle control associated with the use of contraceptive vaginal rings containing 17β-estradiol and the progestagens etonogestrel or nomegestrol acetate compared to NuvaRing

    I. Duijkers, C. Klipping, D. Heger-Mahn, G. N. Fayad +3 more

    2018European journal of contraception & reproductive health care7 citations

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41. CHARACTERIZATION OF PITUITARY AND OVARIAN HORMONE CONCENTRATIONS DURING TREATMENT WITH RELUGOLIX COMBINATION THERAPY

    I. Duijkers, E. Migoya, J. A. Arjona Ferreira, C. Klipping

    2020Fertility and Sterility6 citations Open access

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42. Ovulation inhibition with a new vaginal ring containing trimegestone.

    I. Duijkers, C. Klipping, C. Draeger, B. Schug +3 more

    2020Contraception5 citations

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43. Pharmacokinetics of two human menopausal gonadotrophin preparations after single intravenous administration during pituitary suppression.

    I. Duijkers, M. Beerens, H. T. C. Coelingh Bennink, J. A. Huisman +2 more

    1995Human Reproduction5 citations

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44. Inhibition of ovulation and pharmacologic mechanism of action of relugolix combination therapy.

    I. Duijkers, C. Klipping, C. Draeger, B. Schug +4 more

    2025Fertility and Sterility4 citations Open access

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45. A two-centre, open-label, randomised study of ovulation inhibition with three transdermal contraceptive patches, each containing different amounts of ethinyl estradiol and gestodene in healthy, young women

    K. Waellnitz, I. Duijkers, C. Klipping, T. Rautenberg +2 more

    2016Journal of Obstetrics and Gynaecology Research4 citations

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46. Serum levels of follicle-stimulating hormone and luteinizing hormone after subcutaneous administration of human menopausal gonadotropin during pituitary suppression.

    I. Duijkers, Yvonne M. M. Magnusson, H. M. Hollanders

    1995International journal of fertility and menopausal studies3 citations

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47. Patterns of serum FSH, LH and hCG after i.m. or i.v. administration of hMG during pituitary suppression.

    I. Duijkers, H. M. Hollanders, W. Willemsen, R. de Leeuw +1 more

    1995International journal of fertility and menopausal studies3 citations

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48. The Effect of Estetrol/Drospirenone on Ovarian Function Is Similar to a Well-Established Combined Oral Contraceptive: Results From a Phase 2 Study

    I. Duijkers, C. Klipping, M. Jost, A. Bastidas +1 more

    2021Journal of the Endocrine Society2 citations Open access

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49. Follicular fluid hormone concentrations after ovarian stimulation using gonadotropin preparations with different FSH/LH ratios. I. Comparison of an FSH-dominant and a purified FSH preparation.

    I. Duijkers, W. Willemsen, H. M. Hollanders, C. Hamilton +2 more

    1997International journal of fertility and women's medicine2 citations

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50. Follicular fluid hormone concentrations during controlled ovarian hyperstimulation using gonadotropin preparations with different FSH/LH ratios. I. Comparison of an FSH-dominant and a purified FSH preparation.

    I. Duijkers, W. Willemsen, H. M. Hollanders, C. Hamilton +2 more

    1997International journal of fertility and women's medicine2 citations

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