Are vouchers appropriate for hard-to-match patient-donor kidney exchange pairs?

A recent letter from Mayo Clinic transplant providers raises concerns related to bad outcomes when some patient-donor pairs are separated (the donor donates before the intended recipient is matched to a donor), but the intended recipient is hard to match. Donor Mentoring in Private Kidney Paired Donation Programs: The Need for Transparency and Accountability by Tayyab S. Diwan, Pooja Bhudiraja,…