Working group looked at 9/11 studies done since seven years ago . Survivors reported higher levels of PTSD and respiratory problems such as asthma . Interactive : More federal funds needed for medical services for at-risk groups , panel says . Watch more than 100 memorials in Washington and New York on CNN.com Live .
Working group looked at 9/11 studies done since seven years ago . Survivors reported higher levels of PTSD and respiratory problems such as asthma . More federal funds needed for medical services for at-risk groups , panel says . Watch more than 100 memorials in Washington and New York on CNN.com Live .