Polycythemia is sometimes called erythrocytosis , but the terms are not synonymous , because polycythemia refers to any increase in red blood mass ( due to an erythrocytosis or not ) , whereas erythrocytosis only refers to a documented increase of red cell count .
PROPN AUX ADV VERB NOUN , CCONJ DET NOUN VERB PART ADJ , SCONJ NOUN VERB ADP DET NOUN ADP ADJ NOUN NOUN ( ADP ADP DET NOUN CCONJ PART ) , SCONJ NOUN ADV VERB ADP DET VERB NOUN ADP ADJ NOUN NOUN .