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The name of the fourth author was spelled incorrectly. The correct spelling is: Charles H. Cunningham. The correct citation is: Chen AP, Chu W, Gu Y-P, Cunningham CH (2013) Probing Early Tumor Response to Radiation Therapy Using Hyperpolarized [1-13C]pyruvate in MDA-MB-231 Xenografts. PLoS ONE 8(2): e56551. doi:10.1371/journal.pone.0056551
Competing Interests: No competing interests declared.
