Funding for this research was provided by:
National Health and Medical Research Council (1009460)
Received: 7 December 2018
Accepted: 24 December 2019
First Online: 7 January 2020
Compliance with ethical standards
: The authors declare that they have no competing interests.
: The Mater Hospital and University of Queensland Study of Pregnancy (MUSP) in Australia has been approved by the Human Ethics Review Committee of the University of Queensland. Additional approval granted from the Human Ethics Research Office of the University of Queensland (Clearance number 2017001622) to undertake the present study. Written informed consent was obtained from all participants of the study.