Protocol to request
            
                Microbial DNA extraction, library preparation, and next-generation sequencing
                
                
            
        
        
            
                Research Article
            
            
                The relationship between gut and nasopharyngeal microbiome composition can predict the severity of COVID-19
                
            
            
            
                Benita Martin-Castaño et al.
            
            
                DOI: 10.7554/eLife.95292