Costs can include payment for medical personnel to be on call for death, vitrification, transportation in dry ice to a preservation facility, and payment into a trust fund intended to cover indefinite storage in liquid nitrogen and future revival costs.[23][24] As of 2011, U.S. cryopreservation costs can range from $28,000 to $200,000, and are often financed via life insurance.[23] KrioRus, which stores bodies communally in large dewars, charges $12,000 to $36,000 for the procedure.[25] Some patients opt to have only their head, rather than their whole body, cryopreserved. As of 2016, four facilities exist in the world to retain cryopreserved bodies; three are in the U.S., and one is in Russia.[2][26] As of 2014, about 250 people have been cryogenically preserved in the U.S., and around 1,500 more have signed up to be preserved.[10]