healthline presents: polio revisited (part 1) Published 9 years ago • 3.2K plays • Length 8:02 Download video MP4 Download video MP3 Similar videos 13:11 rsna24 summary - day 1 22:36 w5: valuable lessons from canada's polio epidemic 11:49 1956 iron lung 7:45 s1e1 what’s new in blue feat. dr. sheinberg 1:03 walker production line