Pulmonary embolism rule-out criteria (PERC) in pulmonary embolism—revisited: A systematic review and meta-analysis
Balwinder Singh, Shannon K Mommer, Patricia J Erwin, Soniya S Mascarenhas, Ajay K Parsaik
Emergency Medicine Journal Sep 2013, 30 (9) 701-706; DOI: 10.1136/emermed-2012-201730