Department of Anaesthesia, Northern Adelaide Local Health Network, Lyell McEwin Hospital, Vale, Elizabeth, SA, Australia. Discipline of Acute Care Medicine, Adelaide Medical School, The University of Adelaide, SA, Australia. Discipline of Psychiatry, Adelaide Medical School, The University of Adelaide, Adelaide, SA, Australia. Northern Adelaide Mental Health Services, Lyell McEwin Hospital, Vale, Elizabeth, SA. Robinson Research Institute. University of South Australia, Clinical and Health Sciences, Quality Use of Medicines Pharmacy Research Centre, SA, Australia. Department of Obstetrics and Gynaecology, Lyell McEwin Hospital, SA, Australia. Adelaide Medical School, The University of Adelaide, SA, Australia. Hunter Medical Research Institute, Newcastle, NSW.