Assertion: spontaneous pneumothorax | /r/HasProperty | common clinical problem
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Source sentences:
text: Primary spontaneous pneumothorax is a common clinical problem and its incidence is thought to be increasing.
text: A spontaneous pneumothorax is also a common cause of a pneumothorax that is typically seen in smokers or in patients with either a congenital bleb or blebs from chronic obstructive pulmonary disease (COPD).