The Amino-Terminal Fragment of Pro-Brain Natriuretic Peptide in Plasma as a Biological Marker for Predicting Mortality in Community- Acquired Pneumonia: A Cohort Study oleh Manuel Antonio Tazón-Varela, Pedro Muñoz-Cacho, Héctor Alonso-Valle, Jaime Gallo-Terán, Luis Angel Pérez-Mier, Luis Fernando Colomo-Mármol