The sister of the last known polio patient in the US to use the life-saving machine speaks to the BBC about her sister's life.
Martha Lillard was the last polio patient in the US who used an iron lung but her family told the BBC she never let it slow her down.
Even with the large metal device encircling her body for hours e… [+4663 chars]
Even with the large metal device encircling her body for hours e… [+4663 chars]