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Challenge of surrogate endpoints.
Furgerson JL, Hannah WN Jr, Thompson JC. Furgerson JL, et al. Among authors: hannah wn jr. South Med J. 2012 Mar;105(3):156-60. doi: 10.1097/SMJ.0b013e318249891e. South Med J. 2012. PMID: 22392212 Review.