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- Hospital of the University of Pennsylvania - Philadelphia, PA, U.S.A.
- University of Michigan Medical Center - Ann Arbor, MI, U.S.A.
- UCLA Medical Center - Los Angeles, CA, U.S.A.
- John Hopkins Hospital - Baltimore, MD, U.S.A.
- Cleveland Clinic - Cleveland, OH, U.S.A.
- Massachusetts General Hospital - Boston, MA, U.S.A.
- Yale University Medical Center - New Haven, CT, U.S.A.
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