title: A time series would have been better.
authors.forename: C
authors.initials: C
authors.lastname: van Walraven
authors.forename: A J
authors.initials: AJ
authors.lastname: Forster
mesh_terms: D036861:Delivery, Obstetric / Q000191:economics*; D005260:Female; D006801:Humans; D010818:Practice Patterns, Physicians' / Q000191:economics*; D011247:Pregnancy