郑州市第七人民医院接受采访时说近期（三个月）做了100例心脏移植手术，全国且有心脏移植资质的医院公开的有76家。100×4×76=30400，理论上每年至少有30400个心脏被移植。心脏每个人只有一颗，心脏是怎么来的？
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