Negative pressure wound therapy in patients with wounds healing by secondary intention: a systematic review and meta-analysis of randomised controlled trials oleh Yvonne Zens, Michael Barth, Heiner C. Bucher, Katrin Dreck, Moritz Felsch, Wolfram Groß, Thomas Jaschinski, Heike Kölsch, Mandy Kromp, Inga Overesch, Stefan Sauerland, Sven Gregor