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madmadmad madmadmad
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6 years ago
The two most frequent causes of ulcers are
 
  a. Helicobacter pylori and stress.
  b. Helicobacter pylori and smoking.
  c. Helicobacter pylori and NSAIDs.
  d. Helicobacter pylori and alcohol.
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kjhgfdwrertkjhgfdwrert
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6 years ago
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madmadmad Author
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6 years ago
this is exactly what I needed
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Yesterday
You make an excellent tutor!
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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