title: Reply.
authors.affiliation: Obstetrics and Gynecology, University of Auckland, Auckland, New Zealand. Electronic address: m.wise@auckland.ac.nz.
authors.forename: Michelle R
authors.initials: MR
authors.lastname: Wise
authors.affiliation: Obstetrics and Gynecology, University of Auckland, Auckland, New Zealand.
authors.forename: Cynthia M
authors.initials: CM
authors.lastname: Farquhar