[Cardiovascular surgery in national sanatoriums].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D006348:Cardiac Surgical Procedures; D002648:Child; D002675:Child, Preschool; D005260:Female; D006331:Heart Diseases / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D013223:Statistics as Topic; D013997:Time Factors