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
Risk factor for carcinoma stomach are all, EXCEPT:
assistant
The correct answer is  Impoant quotes (Maingot's 10/e, Page 1007): In several large studies from the scandinan countries, it was found that there is no correlation between gastric cancer and blood group A. Ref: Maingot's 10/e, Page 1007.