title: Authors' reply.
authors.affiliation: Primary Care Clinical Sciences, University of Birmingham, Birmingham, UK.
authors.forename: A
authors.initials: A
authors.lastname: Daley
mesh_terms: D003863:Depression / Q000517:prevention & control*; D003866:Depressive Disorder / Q000517:prevention & control*; D005081:Exercise Therapy / Q000379:methods*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000517:prevention & control*