Comparison of two methods to estimate adverse events in the IBEAS Study (Ibero-American study of adverse events): cross-sectional versus retrospective cohort design

Aranaz Andrés JM, Limón Ramírez R, Aibar Remón C,Gea-Velázquez de Castro MT, Bolúmar F, Hernández-Aguado I, López Fresneña N,Díaz-Agero Pérez C, Terol García E, Michel P, Sousa P, Larizgoitia Jauregui I;IBEAS Teamwork. Comparison oftwo methods to estimate adverse events in the IBEAS Study (Ibero-American studyof adverse events): cross-sectional versus retrospective cohort design. BmjOpen. 2017. 7 (10): 10.