fused-head-end technique 镕合头端技术
About 40% of twins fused at the head are stillborn or die during labour and a third die within 24 hours.
BBC: Conjoined twins separated by Great Ormond Street doctors
Conjoined twins are very rare - only one in every 2.5 million births - and only 5% of conjoined twins are craniopagus, which means they are fused at the head.
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