In this file photo certified registered nurse anesthetist Dori Smith shows a young patient how her face mask works before a procedure at the UNC Children's Hospital in Chapel Hill.
In this file photo certified registered nurse anesthetist Dori Smith shows a young patient how her face mask works before a procedure at the UNC Children's Hospital in Chapel Hill. N&O file photo
In this file photo certified registered nurse anesthetist Dori Smith shows a young patient how her face mask works before a procedure at the UNC Children's Hospital in Chapel Hill. N&O file photo