Assertion: cystic fibrosis | /r/CapableOf | become widespread
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Source sentences:
text: In normal conditions the pleura is a very flexible mucus membrane, but when pleural fibrosis occurs, the pleura thickens and stiffens, pleural fibrosis is usually benign but complications can occur if the pleural fibrosis becomes widespread, when for example breathlessness and ‘strangulation’ of the lungs occur.