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The primary focus is on those factors with a quantitatively important impact from a public health perspective , as indicated by their large etiologic fraction ( population attributable risk ) . But , where treatment of these conditions is inadequate or not available , it may be argued from a public health perspective , that their effects are an integral part of the risk attached to SGA . I also would like to thank Senator Specter for his leadership in fostering interagency collaborations to deal from a public health perspective with mental health concerns of youth , including violent behavior directed at others and self in the form of suicide . From a public health perspective , physical therapy and other forms of rehabilitation are considered methods of tertiary prevention in this population . Of all of the ocular diseases associated with solar exposure , that which affects the lens , cataract , is by far the most important from a public health perspective .