coronavirus disease(17) COVID-19(16) pandemic(12) COVID-19 pandemic(11) reported(10) Result(6) IMPROVE(6) Course(6) Patient(6) Infection(5) conducted(5) Support(5) Health(5) collected(4) analyzed(4) Reporting(4) severe acute respiratory syndrome coronavirus 2(4) item(4) were used(4) review(4) Distance education(4) Research(4) Analysis(4) required(4) PROTECT(4) Republic of Korea(4) clinical examination(3) assessment(3) change(3) investigated(3)