[1
]
University of Adelaide, Adelaide, South Australia 5000, Australia.
[2
]
Department of Obstetrics and Gynaecology, Center for Reproductive Medicine, Academic
Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands.
[3
]
Medical Statistics Team, Institute of Applied Health Sciences, University of Aberdeen,
Aberdeen AB24 3FX, UK.
[4
]
Western Ultrasound for Women, West Leederville, Western Australia 6007, Australia.
[5
]
Department of Reproductive Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam,
1081 HV Amsterdam, The Netherlands.
[6
]
Academic Unit of Obstetrics and Gynaecology, University of Bristol, St Michael's Hospital,
Bristol BS8 1TH, UK.
[7
]
Women's and Children's Health, Dunedin School of Medicine, The University of Otago,
Dunedin 9016, New Zealand.
[8
]
Department of Obstetrics and Gynecology, Institute of Clinical Sciences, Sahlgrenska
Academy, University of Gothenburg and Sahlgrenska University Hospital, 413 45 Göteborg,
Sweden.
[9
]
Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University
Hospital, FI-00029 HUS, Helsinki, Finland.
[10
]
Department of Public Health, University of Copenhagen, 1014 Copenhagen K, Denmark.
[11
]
Department of Biostatistics and Research Support, Julius Centre, University Medical
Centre, 3584 CX Utrecht, The Netherlands.
[12
]
Discipline of Obstetrics and Gynaecology, Robinson Research Institute, University
of Adelaide, South Australia 5006, Australia.
[13
]
Department of Obstetrics and Gynaecology, Monash Medical Centre, Monash Health and
Monash University, Clayton 3800, Victoria, Australia.