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The push to vaccinate as many americans as possible from covid-19 has been massive. but making sure everyone has access isn't easy. two cnn heroes, dr. jim withers and dr. wendy ross, are going the extra mile to make sure the people they serve don't miss out on these lifesaving measures. cnn's anderson cooper has more. >> reporter: in pittsburgh, dr. jim withers brings medical care and now vaccines to those experiencing homelessness. >> can i take a listen? you really have to go to where one is and cut down those barriers when you provide something that can save a life and the lives of people ...