COVID-19(6) emergency service(4) emergency department(4) hospital(3) disease outbreaks(2) Interrupted time series analysis(1) Chronic Hepatitis B(1) Severe acute respiratory syndrome coronavirus 2.(1) Emergency(1) Suicidality.(1) COVID-19 pandemic(1) pandemic.(1) mental health(1) Isolation(1) adolescents(1) Influenza(1) patients.(1) Lockdown.(1) targeted screening.(1) rural hospital.(1) registry.(1) healthcare(1) Australia(1) overdose(1) Hepatitis B virus(1) Health personnel(1) Quality improvement(1) self-harm(1) sentinel surveillance.(1) SARS-CoV-2(1)