7[1]STEVENSON W G, STEVENSON L W, MIDDLEKAUFF H R, et al. Improving survival of patients with advanced heart failure; a study of 737 consecutive patients[J]. Am Coll Cardiol, 1995, 26:1417.
8Marantz, P. R., Tobin, J. N., Wassertheil-Smoller, S., et al. The relationship between left ventricular systolic funticm and congestive heart failure diagnosed by clinical criteria[J]. Criculation, 1988,77 : 607.
