| Http://: http://www.mayoclinic.com/health/polio/DS00572/DSECTION=symptoms |
| Http://: https://www.sciencedirect.com/topics/neuroscience/paralytic-polio |
| Http://: http://www.mayoclinic.com/health/polio/DS00572/DSECTION=symptoms |
| Http://: https://www.sciencedirect.com/topics/neuroscience/paralytic-polio |