Workers participate voluntarily, pay fees voluntarily, cooperate with each other, and guarantee special assistance enjoyed by * * *. Mutual fund is a special fund for people to help each other, which is used to help trade union members alleviate temporary difficulties caused by special reasons and serious diseases. Employees participating in mutual medical insurance shall, on the basis of enjoying the national basic medical insurance and enterprise supplementary medical insurance, give certain subsidies to the medical expenses borne by individuals.