【单选题】A 68-year-old man from Birmingham, England, has had "heartburn"and substernal pain after meals for 25 years. For the past vear, he has had increased pain with difficulty swal- lowing both liquids and ...
【单选题】A 68-year-old man from Birmingham, England, has had “heartburn” and substernal pain after meals for 25 years. For the past year, he has had increased pain with difficulty swallowing both liquids and s...