[1] Univ Sydney, Sydney Sch Publ Hlth, Prevent Res Collaborat, Sydney, NSW, Australia
[2] Univ Sydney, Charles Perkins Ctr, Level 6, Sydney, NSW 2006, Australia
[3] Univ Queensland, NHMRC Ctr Res Excellence Stillbirth, Mater Res Inst, Brisbane, Qld, Australia
[4] Safer Care Victoria, Matern & Newborn Clin Network, Melbourne, Vic, Australia
[5] Safer Care Victoria, Ctr Clin Excellence, Melbourne, Vic, Australia