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

Jesus Maria Aranaz Andrés,1,2,3,4 Ramon Limón Ramírez,5 Carlos Aibar Remón,6,7Maria Teresa Gea-Velázquez de Castro,8,9 Francisco Bolúmar,2,10
Ildefonso Hernández-Aguado,2,9 Nieves López Fresneña,1,3,4
Cristina Díaz-Agero Pérez,1,3,4 Enrique Terol García,11 Philippe Michel,12

Paulo Sousa,13 Itziar Larizgoitia Jauregui,14 IBEAS Teamwork. BMJ BMJ open Volume 7 Issue 10