First of all the study in the journal of medicine was retracted for misinformation and misleading statements. The conclusion of the study was that there were not any obvious dangers but more study was needed to determine this fully. Furthermore a non reliable source of data was used- namely a self reported survey of under 1000 women. Also there was sleight of hand regarding the total numbers as they were combined in a way to look like the risk was comparable to regular pregnancies which it was not. After it was analyzed by other scientists it was retracted because the conclusion was obviously inaccurate and blatantly false.
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