u003Cu002Fwbmd_c_vid_citationsu003Eu003Cwbmd_c_loc_urlu003Eu002Fdeliveryu002Fawsu002F4du002F4eu002F4d4e6fa1-8203-4df8-8229-2c93185a4656u002Fcf4ec3bd-8925-4e4f-a462-e98bf74acf5f_363113_01_basics_polycythemia_vera_111022_,4500k,2500k,1000k,750k,400k,.mp4u003Cu002Fwbmd_c_loc_urlu003Eu003Cwbmd_c_vid_trns" style="max-width:100%;" height="640" autoplay controls playsinline src="https://www.webmd.com/cancer/polycythemia-vera" onload="function(){onvidplay(this.src)}">