TY - JOUR AU - Marchioli, R; Finazzi, G; Specchia, GCYTO-PV Collaborative Group TI - Cardiovascular events and intensity of treatment in polycythemia vera JO - N Engl J Med VL - 368 PY - 2013 DO - 10.1056/NEJMoa1208500 SP - 22 EP - 33 N1 - et al. ER -