Table 1. Comparison of different allocation models.

Principle	Center decision	Waiting time plus urgency	Allocation score
Equity	(+)	+	++
Justice	(+)	+	(+)
Beneficence	(+)	(+)	++
Utility	(+)	(+)	++
Survival	(+)	+	++
Quality of life	(+)	−	−
Countries	UK, Italy, Belgium	Switzerland, France	US, Germany, the Netherlands

(+), variably influenced; +, influenced; ++, strongly influenced; −, not influenced.