主题词：COVID-19 Clinical Research Studies; SARS-CoV-2 and COVID-19 Research; COVID-19 epidemiological studies; Hepatocellular Carcinoma Treatment and Prognosis; Hepatitis C virus research; Long-Term Effects of COVID-19; Liver Disease Diagnosis and Treatment; COVID-19 and Mental Health; Hepatitis B Virus Studies; COVID-19 and healthcare impacts; HIV/AIDS Research and Interventions; Healthcare Systems and Reforms; Disaster Response and Management; HIV Research and Treatment; Gastric Cancer Management and Outcomes; Viral Infections and Outbreaks Research; HIV/AIDS drug development and treatment; Global Maternal and Child Health; Cholangiocarcinoma and Gallbladder Cancer Studies; Geriatric Care and Nursing Homes; Health Systems, Economic Evaluations, Quality of Life; Palliative Care and End-of-Life Issues; Vaccine Coverage and Hesitancy; HIV-related health complications and treatments; SARS-CoV-2 detection and testing