Pisa F, Castellsague J, Rosolen V, Riera-Guardia N, Giangreco M, Drigo D, Perez-Gutthann S. Impact of case validation on incidence rates of upper gastrointestinal complications. Poster presented at the 28th ICPE International Conference on Pharmacoepidemiology & Therapeutic Risk Management; August 2012. Barcelona, Spain. [abstract] Pharmacoepidemiol Drug Saf. 2012 Aug; 21(Suppl 3):178. doi: 10.1002/pds.3324