Kremer JA

BackgroundPolycystic ovary syndrome (PCOS) is the most common cause of infrequent periods (oligomenorrhoea) and absence of periods (amenorrhoea). It affects about 5% to 20% of women worldwide and often leads to anovulatory infertility. Arom…

BackgroundPolycystic ovary syndrome (PCOS) is the most common cause of infrequent periods (oligomenorrhoea) and absence of periods (amenorrhoea). It affects about 4% to 8% of women worldwide and often leads to anovulatory subfertility. Arom…

BackgroundAmong subfertile women undergoing assisted reproductive technology (ART), hormone pills given before ovarian stimulation may improve outcomes.ObjectivesTo determine whether pretreatment with the combined oral contraceptive pill (C…

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…

BackgroundOnline health communities are becoming more popular in health care. Patients and professionals can communicate with one another online, patients can find peer support, and professionals can use it as an additional information chan…

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: Endometriosis is prevalent and women need high-quality care, which should be patient-centered. This study aimed to develop a valid and reliable patient-centeredness questionnaire, based on a defined concept of patient-centered e…

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…