The efficacy and safety of influenza vaccination in older people: An umbrella review of evidence from meta-analyses of both observational and randomized controlled studies

Jacopo Demurtas, Stefano Celotto, Charlotte Beaudart, Dolores Sánchez‐Rodríguez, Cafer Balcı, Pınar Soysal, Marco Solmi, D Celotto, Elena Righi, Lee Smith, Pier Luigi Lopalco, Vania Noventa, Jean Pierre Michel, Gabriel Torbahn, Francesco Di Gennaro, Damiano Pizzol, Nicola Veronese, Stefania Maggi