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International Stroke Trial Collaborative Group
The International Stroke Trial (IST): a randomised trial of aspirin, subcutaneous heparin, both, or neither among 19435 patients with acute ischaemic stroke
Lancet. 1997 May 31;349(9065):1569-1581
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Turkstra F, Kuijer PM, van Beek EJ, Brandjes DP, ten Cate JW, Buller HR
Diagnostic utility of ultrasonography of leg veins in patients suspected of having pulmonary embolism
Ann Intern Med. 1997 May 15;126(10):775-781