Performance of 4 clinical decision rules in the diagnostic management of acute pulmonary embolism: a prospective cohort study. - Douma RA; Mos IC; Erkens PM; Nizet TA; Durian MF; Hovens MM; van Houten AA; Hofstee HM; Klok FA; ten Cate H; Ullmann EF; Büller HR; et al. (Annals of Internal Medicine, 2011)