1. School of Medicine and Public Health University of Newcastle Callaghan NSW Australia
2. Health Protection Hunter New England Local Health District Wallsend NSW Australia
3. National Centre for Immunisation Research and Surveillance (NCIRS) Sydney Children's Hospital Westmead NSW Australia
4. Public Health Mid‐North Coast Local Health District Port Macquarie NSW Australia
5. Port Macquarie Community Health Mid‐North Coast Local Health District Port Macquarie NSW Australia