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To find out risk factors of incidences of long-term complications of thrombosis, myelofibrosis with myeloid metaplasia (MMM) and evolution into malignance in Chinese PV patients, we evaluated 320 PV patients referred to our center from April 1984 to June 2005 by Kaplan–Meier estimation and Cox proportional hazards models. A total of 250 events of thrombosis were observed in 138 (43.13%) patients....
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