Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Patent Ductus Arteriosus? ?
    ### Response:
    Patent ductus arteriosus (PDA) is a relatively common congenital heart defect in the United States.
                
The condition occurs more often in premature infants (on average, occurring in about 8 of every 1,000 births). However, PDA also occurs in full-term infants (on average, occurring in about 2 of every 1,000 births).
    