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What is All of the following are the high risk factors for DVT except: and explain in detail?
Risk of DVT in Relation to age and duration of surgery High risk Moderate risk Low risk General urological in patients > 40 years Extensive pelvic or abdominal surgery Major ohopaedic surgery of lower limbs General surgery in patients >= 40 years Surgery lasting for >= 30 minutes General surgery in patients < 40 years on OCPs Uncomplicated surgery in patients < 40 years without additional risk Minor surgery (<30 minutes) in patients < 40 years additional risk