birthday cards
... that researchers found that sending birthday cards to 21-year-olds did not help reduce harmful birthday drinking?
... that researchers found that sending <b id="mwATA"><a href="./Birthday_card" id="mwATE" rel="mw:WikiLink" title="Birthday card">birthday cards</a></b> to 21-year-olds did not help reduce <a href="./Binge_drinking" id="mwATI" rel="mw:WikiLink" title="Binge drinking">harmful birthday drinking</a>?