title: Timing is everything: the pendulum swings on.
authors.forename: Dominique
authors.initials: D
authors.lastname: Chassard
authors.forename: Bernard
authors.initials: B
authors.lastname: Allaouchiche
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Boselli
mesh_terms: D016362:Analgesia, Obstetrical; D000701:Analgesics, Opioid / Q000008:administration & dosage*; D002909:Chronobiology Phenomena; D005260:Female; D005283:Fentanyl / Q000008:administration & dosage*; D006801:Humans; D011247:Pregnancy; D013997:Time Factors
chemical_list: D000701:Analgesics, Opioid; D005283:Fentanyl