Women who have already tried inserting the tablets are advised to stop and seek medical attention if needed.
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Cristiano Ronaldo retires from international football
Portugal legend Cristiano Ronaldo says "the day has come for me to hand back the number seven shirt".
Ronaldo retires from Portugal duty
Portugal legend Cristiano Ronaldo says "the day has come for me to hand back the number seven shirt".
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Ronaldo's most iconic moments as he retires from international football
BBC Sport looks at some of the most iconic moments from the career of Cristiano Ronaldo as he retires from international football.
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