title: [Long-term follow-up of artificial valves in patients under 15 years of age (author's transl)].
mesh_terms: D000293:Adolescent; D001705:Bioprosthesis; D002114:Calcinosis / Q000209:etiology; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006349:Heart Valve Diseases / Q000601:surgery; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D011183:Postoperative Complications; D013997:Time Factors