Code systems

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Code	Complete	Precise	License	Maintained
atc	87	11	Open	Formalized
cis	18	100	Liberal	Formalized
cvc	83	29	Liberal	Structured
cvx	90	16	Open
gt_standard	1
nuva	100	100	Open	Regular, unstructured
snomed-ct	81	4	Closed	Formalized