Comparing serum and pleural fluid pro-brain natriuretic peptide (NT-proBNP) levels with pleural-to-serum albumin gradient for the identification of cardiac effusions misclassified by Light's criteria

1. Porcel, J.M.
2. Chorda, J.
3. Cao, G.
4. Esquerda, A.
5. Ruiz-González, A.
6. Vives, M.