However, it does place restrictions on the commercial organ trade in an attempt to limit transplant tourism. The market is contained within the country; that is, foreigners are not allowed to buy the organs of Iranian citizens. Additionally, organs can only be transplanted between people of the same nationality - so, for example, an Iranian cannot purchase a kidney from a refugee from another country.[5] The system is largely charity- and volunteer-based, and those tasked with matching donors and patients are not paid for their work.[6]