OBJECTIVE: To review the literature and present original data to answer the question of
whether in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) is associated with …

This research paper examines the extent to which high-stakes competitive tests affect
gender gaps in standardized tests of Mathematics and Language. To this end, we estimate …

STUDY QUESTION How many twins are born in human populations and how has this
changed over recent decades? SUMMARY ANSWER Since the 1980s, the global twinning …

OBJECTIVE: We sought to review the natural history, pathophysiology, diagnosis, and
treatment options for twin-twin transfusion syndrome (TTTS). METHODS: A systematic …

Objectives To establish the risk factors for monozygotic twin (MZT) and monochorionic twin
(MCT) pregnancies after in vitro fertilization (IVF). Design Systematic review and meta …

Objective To identify the incidence, risk factors, and obstetric/perinatal outcomes associated
with monozygotic twins (MZTs) after IVF. Design Nested case-control. Setting University …

BACKGROUND The incidence of monozygotic twins (MZT) after ART appears to be higher
than the incidence after spontaneous conceptions contradicting the aim of ART to avoid …

BACKGROUND The reasons for increased birth defect prevalence following in-vitro
fertilization (IVF) and intracytoplasmic sperm injection (ICSI) are largely unknown …

Monochorionic twins are subjected to specific complications which originate in either
imbalance or abnormality of the single placenta serving two twins including twin‐to‐twin …

STUDY QUESTION What is the prevalence of multiple pregnancy with zygotic splitting after
single embryo transfer (SET)? SUMMARY ANSWER The prevalence of multiple pregnancy …