US scientists say it could be used to monitor tumours or ulcers for a month in the stomach.
from BBC News - Home https://bbc.in/2ShkLdJ
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By Unknown Author from NYT Corrections https://ift.tt/3wAcAK6
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A selection of powerful images taken around the world this week. from BBC News - Home https://ift.tt/3ftYVyh
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