inclusion criteria: * positive covid-19 test * mild to severe symptoms of covid-19 * hospitalization * who performance status 0-3 * age above or equal to 50 years * can understand all the requirements of the study, provide informed consent, and provide authorization of use and disclosure of personal health information. * estimated expected survival of 1 year (excluding symptoms due to covid-19)

inclusion criteria: * positive covid-19 test * mild to severe symptoms of covid-19 * hospitalization * who performance status 0-3 * age above or equal to 50 years * can understand all the requirements of the study, provide informed consent, and provide authorization of use and disclosure of personal health information. * estimated expected survival of 1 year (excluding symptoms due to covid-19)

inclusion criteria: - positive covid-19 test - mild to severe symptoms of covid-19 - hospitalization - who performance status 0-3 - age above or equal to 50 years - can understand all the requirements of the study, provide informed consent, and provide authorization of use and disclosure of personal health information. - estimated expected survival of 1 year (excluding symptoms due to covid-19)

inclusion criteria: - positive covid-19 test - mild to severe symptoms of covid-19 - hospitalization - who performance status 0-3 - age above or equal to 50 years - can understand all the requirements of the study, provide informed consent, and provide authorization of use and disclosure of personal health information. - estimated expected survival of 1 year (excluding symptoms due to covid-19)