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Researchers believe the increased threat may come from the body rejecting donated eggs or underlying health problems that may come to the fore during artificial conception.
They want increased vigilance so that the exact nature of the risk can be calculated.
"Women should be counselled and made aware of the risks they are taking and deaths should be properly reported," Professor Didi Braat at Radboud University in the Netherlands told the Sunday Times.
Prof Braat looked at the deaths between 1984 and 2008 in the Netherlands but believes they will apply to any developed country.