King is the director at the Seattle Children's Autism Center and director of child and adolescent psychiatry at the University of Washington and Seattle Children's Hospital.

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Johnson, a pioneering Washington journalist and author who helped redefine political reporting in addition to appearing on PBS and teaching journalism at the University of Maryland, died Friday at a Washington-area hospital after suffering a heart attack.

WSJ: Journalist and author Haynes Johnson dies at 81

Even if teens have not actually engaged in risky behaviors but merely brag about them online, this can still affect their future behavior, said study co-author Dr. Dimitri Christakis, professor of pediatrics at the University of Washington and director of the Center for Child Health, Behavior and Development at Seattle Children's Hospital.

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Shock waves emanating from bomb blasts can cause bruises to the lungs and intestines that don't become symptomatic for a day or two after a blast, said Babak Sarani, chief of trauma and acute surgery at George Washington University Hospital in Washington, D.

WSJ: Injuries Resemble Traumas of War

Three weeks later, Patterson and Williams were told they would be part of the 26-person transplant effort, coordinated through Georgetown University Hospital and Washington Hospital Center.

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Doctors at George Washington University Hospital, also in the capital, reported an increased in reports of pain and chronic illnesses in the week after the attacks.

BBC: Pain problems 'worse after terror'