tokens: We have studied 48 patients with polycythemia vera and four patients with idiopathic myelofibrosis .
folded_tokens: we have studied 48 patients with polycythemia vera and four patients with idiopathic myelofibrosis .
labels: O O O O O O B-other_name I-other_name O O B-multi_cell O B-other_name I-other_name O