Do case-only designs yield consistent results across design and different databases? A case study of hip fractures and benzodiazepines by Requena, Gema, Logie, John, Martin, Elisa, Boudiaf, Nada, González González, Rocío, Huerta, Consuelo, Alvarez, Arturo, Webb, David, Bate, Andrew, García Rodríguez, Luis A., Reynolds, Robert, Schlienger, Raymond, Gardarsdottir, Helga, de Groot, Mark, Klungel, Olaf H., de Abajo, Fancisco, Douglas, Ian J.

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