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JAMA. 1980;243(19):1951-1952. doi:10.1001/jama.1980.03300450053028.
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Hurst JW (ed): Update II: The Heart . New York, McGraw-Hill Book Co, 1980.
Cardiovascular Diseases: Guidelines for Prevention and Care . New York, Inter-Society Commission for Heart Disease Resources, 1974.
Luft HS, Bunker JP, Enthoven AC:  Should operations be regionalized? The empirical relation between surgical volume and mortality . N Engl J Med 301:1364-1369, 1979.
Link to Article[[XSLOpenURL/10.1056/NEJM197912203012503]]
Hull R, Delmore T, Genton E, et al:  Warfarin sodium versus low-dose heparin in the long-term treatment of venous thrombosis . N Engl J Med 301:855-858, 1979.
Link to Article[[XSLOpenURL/10.1056/NEJM197910183011602]]
Reitz BA, Stinson EB, Griepp RB, et al:  Tissue valve replacement of prosthetic heart valves for thromboembolism . Am J Cardiol 41:512-515, 1978.
Link to Article[[XSLOpenURL/10.1016/0002-9149(78)90008-5]]
Harthorne JW, Buckley MJ, Grover JW, et al:  Valve replacement during pregnancy . Ann Intern Med 67:1032-1034, 1967.
Link to Article[[XSLOpenURL/10.7326/0003-4819-67-5-1032]]
Hirsh J, Cade JF, O'Sullivan EF:  Clinical experience with anticoagulant therapy during pregnancy . Br Med J 1:270-273, 1970.
Link to Article[[XSLOpenURL/10.1136/bmj.1.5691.270]]

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