In excess of 90,000 people are on the waiting list for kidney transplants, fewer than 17,000 receive one each year, and about 4,500 die on the waiting list. Even where a relative or friend is willing to donate a kidney, the kidney may not be a biological match. To address this problem, paired kidney exchange programs were created. Although it has been more than a decade since the first paired kidney exchange took place in the US, there is still no uniform system for these exchanges. Sandy Feng,
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