NPPB and pulmonary embolism: We determined the search strategy and terms, read a substantial number of papers on the subject, and performed a preliminary search of electronic databases before the main search using keywords ("NT-proBNP" OR "Troponins" OR "D-Dimer" OR "Acute Cardio-Respiratory Syndromes" OR "Biomarkers") AND ("Risk Prediction" OR "Mortality" OR "Cardiac Injury" OR "Pulmonary Embolism") AND ("case-control" OR "cohort study" OR "systematic review").