Resistance trends in gram-negative bacteria: surveillance results from two Mexican hospitals, 2005–2010
Rayo Morfin-Otero*, Juan C Tinoco-Favila, Helio S Sader, Lorena Salcido-Gutierrez, Hector R Perez-Gomez, Esteban Gonzalez-Diaz, Luis Petersen and Eduardo Rodriguez-Noriega