Checking more lymph nodes linked to cancer patient survival

Why do patients with gastric or pancreatic cancer live longer when they are treated at cancer centers or high-volume hospitals than patients treated at low-volume or community hospitals?

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<p><a href="http://www.physorg.com/news135958097.html">Checking more lymph nodes linked to cancer patient survival</a></p> <p>Why do patients with gastric or pancreatic cancer live longer when they are treated at cancer centers or high-volume hospitals than patients treated at low-volume or community hospitals?</p>