[1
]From Tufts-New England Medical Center and Tufts University School of Medicine, Boston,
Massachusetts; Bloomberg School of Public Health, Welch Center for Prevention, Epidemiology
and Clinical Research, and the Johns Hopkins University, Baltimore, Maryland; University
of British Columbia, Vancouver, British Columbia, Canada; University of Minnesota,
Minneapolis, Minnesota; North Texas Hospital for Children, Dallas, Texas; and Baylor
College of Medicine, Houston, Texas.