2Roussi J, Houbouyan L,Tere C,et al. Prophylactic and therapeutic use of a low molecular weight hepar, in fraction, CY 216[J]. J Mal Vasc,1987,12:123 - 127.
5Anonymous. Value of the ventilation/perfusion scan in acute pulmonary embolism. Results of prospective investigation of pulmonary embolism diagnosis (PIOPED). The PIOPED Investigators[J]. JAMA, 1990, 263(20): 2753 - 2759.
6Wells P G, Ginsberg J S, Anderson D R, et al. Use of a clinical model for safe management of patients with suspected pulmonary embolism[J]. Ann Intern Med, 1998, 129(12): 997- 1005.
