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Pregnancy
Labor, Obstetric
Birth Weight
Bulgaria
Pregnancy in Adolescence
Pregnancy Outcomes
Prospective Studies
Time Factors
Incidence
Risk Factors
Parity
Caesarean Section
Newborn Infant
Pregnancy Complications
Obstetric Labor Complications
Eclampsia
Administration, Intravaginal
Obstetric Delivery
Analgesia, Obstetrical
Drug Combinations
Co-Publications
24
8
4
3
1
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