Itīs a system where the majority of the citizens have not obtain healthcare by
their own means, specially subscribing private insurance and only some of them are insuranced by the public Administration.
... by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by P.S.Chuang.
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