![](http://www.alamy.com/thumbs/6/2773F557-C8E2-40CB-A2D8-31B204FC328D/2R3EJ06.jpg)
Medical concept. On a blue surface are puzzles with a question mark, in the center with the inscription - why do edema occur
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Photo credit: © Dzmitry Skazau / Alamy / Afripics
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