title: The clot thickens.
authors.affiliation: Washington, DC. Electronic address: chee.m.chan@medstar.net.
authors.forename: Chee M
authors.initials: CM
authors.lastname: Chan
authors.affiliation: Washington, DC.
authors.forename: Gene L
authors.initials: GL
authors.lastname: Colice
authors.affiliation: Washington, DC.
authors.forename: Andrew F
authors.initials: AF
authors.lastname: Shorr
mesh_terms: D004417:Dyspnea / Q000209:etiology; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications* / Q000628:therapy; D011655:Pulmonary Embolism / Q000175:diagnosis / Q000209:etiology* / Q000517:prevention & control