This common type of birth defect -- known as patent foramen ovale (PFO) -- is a hole between the upper chambers of the heart that does not close after birth.
from WebMD Health http://ift.tt/2BfyHMD
This common type of birth defect -- known as patent foramen ovale (PFO) -- is a hole between the upper chambers of the heart that does not close after birth.
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