1. Department of Obstetrics and Gynaecology and Department of Infectious Diseases, Monash University and Alfred Health, Melbourne, Australia
2. Department of Obstetrics and Gynaecology and Department of Infectious Diseases, Monash University and Monash Health, Melbourne, Australia
3. National Centre for Immunisation Research and Surveillance, University of Sydney, Sydney, Australia
4. Department of Epidemiology and Infectious Diseases, Monash University and Alfred Health, Melbourne, Australia