[1
]
Houston Methodist Hospital, Houston, Texas.
[2
]
Duke University Medical Center, Durham, North Carolina.
[3
]
Northwestern University, Chicago, Illinois.
[4
]
Mayo Clinic, Rochester, Minnesota.
[5
]
University of California, San Francisco, California.
[6
]
Baylor University Medical Center, Dallas, Texas.
[7
]
Columbia University Medical Center, New York, New York.
[8
]
Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
[9
]
Massachusetts General Hospital, Boston, Massachusetts.
[10
]
University of Chicago, Chicago, Illinois.
[11
]
Brigham and Women's Hospital, Boston, Massachusetts.
[12
]
Toronto General Hospital, University Health Network, University of Toronto, Toronto,
Ontario, Canada.
[13
]
MedStar Health Research Institute, Washington, DC.