title: Principles and present status of a prospective multicenter study on the clinical relevance of the Kiel classification.
mesh_terms: D005860:Germany, West; D006801:Humans; D007945:Leukemia, Lymphoid / Q000473:pathology; D008223:Lymphoma / Q000145:classification / Q000473:pathology*; D011379:Prognosis; D011446:Prospective Studies