title: Letter to the editor: authors' response.
authors.affiliation: Center for Dental Education, School of Medicine, Dentistry, and Biomedical Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK.
authors.forename: Martina
authors.initials: M
authors.lastname: Pirie
authors.forename: Chris
authors.initials: C
authors.lastname: Irwin
authors.forename: Gerry J
authors.initials: GJ
authors.lastname: Linden
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D010518:Periodontitis / Q000628:therapy*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000628:therapy*; D011256:Pregnancy Outcome