system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All of the following are risk factors for deep vein thrombosis (DVT) except:
assistant
The correct answer is  Patients over the age of 40 years is a risk factor for DVT. High dose estrogen therapy is also associated with DVT. Ref: Bailey and Love's Sho Practice of Surgery, 24th Edition, Page 970.