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2. The Cancer Registry;National Board of Health and Welfare,1995
3. Colorectal cancer in patients over 70 years old;Kashtan;Isr J Med Sci,1992
4. Elective versus emergency surgery for patients with colorectal cancer;Anderson;Br J Surg,1992
5. Decreased operative mortality from colorectal cancer but unchanged treatment results during 30–40 years;Öhman;Läkartidningen,1982