original question: what physician specializes in the medical specialty specialized by [Massachusetts General Hospital]?
answer: maurice campbell, zoran peri≈°iƒá, graham simpson...
answer type: Physician.
auxiliary information: Massachusetts General Hospital is the original and largest teaching hospital of Harvard Medical School and a biomedical research facility located in the West End neighborhood of Boston, Massachusetts. It is the third oldest general hospital in the United States and the oldest and largest hospital in New England with 950 beds. Massachusetts General Hospital conducts the largest hospital-based research program in the world, with an annual research budget of more than $750 million. It is currently ranked as the #1 hospital in the United States by U.S. News & World Report.
[Massachusetts General Hospital] specializes in this medical specialty, which physicians also specialize in this field?