Jan A.M. Kremer

BACKGROUND: Progesterone prepares the endometrium for pregnancy by stimulating proliferation in response to human chorionic gonadotropin(hCG) produced by the corpus luteum. This occurs in the luteal phase of the menstrual cycle. In assisted…

BACKGROUND: Endometriosis is a prevalent condition compromising physical and psychosocial health and thus requiring patient-centered care, which is guided by patients' values. This study aimed to find out what the patient's perspective on e…

STUDY QUESTION: How patient-centered are two included specialized endometriosis clinics relative to each other and how can they improve the patient-centeredness of their care? SUMMARY ANSWER: The validated ENDOCARE questionnaire (ECQ) relia…

BACKGROUND: Clinical guidelines are intended to improve healthcare. However, even if guidelines are excellent, their implementation is not assured. In subfertility care, the European Society of Human Reproduction and Embryology (ESHRE) guid…

BACKGROUND: Although in vitro fertilization (IVF) was introduced more than 30 years ago, its exact role in the spectrum of fertility treatments has never been studied in an unselected population. The aim of this study was to visualize the c…

Monitoring reproductive health by the Reprostat indicators in Europe will facilitate the transparency of reproductive health as well as comparisons over time and between countries. However, for the monitoring and improvement of reproductive…

24 women with a so-called pin-hole cervical os during the pre-ovulatory phase of the menstrual cycle were detected in a group of 850 infertile couples. This cervical condition is rarely seen and is often combined with extreme oligomucorrhea…