Correction: Risk factors associated with severe outcomes in adult hospitalized patients according to influenza type and subtype

• Ana Martínez, 
• Núria Soldevila, 
• Arantxa Romero-Tamarit, 
• Núria Torner, 
• Pere Godoy, 
• Cristina Rius, 
• Mireia Jané, 
• Àngela Domínguez and the Surveillance of Hospitalized Cases of Severe Influenza in Catalonia Working Group