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Scientists said the treatment offered particular hope for older women and could be performed with none of the side-effects associated with standard fertility treatment.

The pioneers of the “mini-IVF” technique said the treatment was so quick and straightforward it could be carried out in a woman’s lunch hour.

Trials involving more than 500 patients achieved success rates one third better than those in Britain for women in their 30s and more than twice as high among those in their 40s.

The technique works by giving women far lower doses of the drugs used to stimulate the ovaries at the start of the IVF treatment.

Scientists said they found that giving low dosages of the standard medication over a longer period meant women avoided premature ovulation so produced eggs of higher quality.

This was particularly significant for older women who are likely to produce far fewer eggs.

Dr Sherman Silber, a fertility specialist, who presented the findings to the American Society for Reproductive Medicine’s annual conference in Boston, said: “This is a very significant breakthrough; it was amazing to see the...