MAIN TEXT Haruo Usuda, Corresponding Author Haruo Usuda haruo.usuda@uwa.edu.au orcid.org/0000-0002-9334-8086 Division of Obstetrics and Gynecology, The University of Western Australia, Crawley, WA, Australia Center for Perinatal and Neonatal Medicine, Tohoku University Hospital, Sendai, Miyagi, Japan Corresponding author Haruo Usuda, M.D, PhD. Division of Obstetrics and Gynaecology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.