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BACKGROUND Preterm birth, the birth of an infant prior to 37 completed weeks of gestation, is the leading cause of perinatal morbidity and mortality. Preterm infants are at greater risk of respiratory, gastrointestinal and neurological diseases. Despite significant research in developed countries, little is known about the causes of preterm birth in many(More)
Y-chromosome microdeletions (YCMs) have been found at a much higher rate in infertile men than fertile controls. A specific deletion in the azoospermia factor locus (AZF) at Yq11 is significantly associated with male infertility. Whether assisted reproductive technology (ART) increases the risk of YCM in ART-derived offspring remains unclear. In this study(More)
OBJECTIVE To comprehend the young migrants' sexual behavior and contraceptive status, and to provide the scientific basis for the health education regarding sex and reproduction for the young migrants in cities. METHODS An anonymous self-designed structured questionnaire was used to survey 4 389 young migrants in Beijing, Guangzhou and Ji'nan. RESULTS(More)
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