In a five-year case-control study (1988 to 1993) at Assir Central Hospital (ACH), Abha (8,000 feet above sea level), Saudi Arabia, 92 of 129 patients suspected of deep venous thrombosis (DVT) were studied with ascending contrast venography (CV) (74 patients, 80.4%) or Doppler ultrasonography (DUS) (18 patients, 19.6%).
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