Electronic Health Records Humans competition electronic health record health information technology human Aged Asymptomatic infection COVID-19 Cancer Care Facilities Clinical decision support Commerce Cross-Sectional Studies Diffusion of Innovation Efficiency, Organizational Health Information Exchange Hospitals Interviews as Topic Medical Informatics Medicare Models, Theoretical Primary care provider Qualitative Research Randomized clinical trial Recruitment Reinfection SARS-CoV-2 Socioeconomic Factors United States University settings