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Taking the mystery out of "mystery shopper" studies.
N Engl J Med 365(6):484-6 (2011) PMID 21793739
DOI: 10.1056/NEJMp1107779
Version: za2963e q8zac q8zb4 q8zce q8zd8 q8zee q8zfe q8zge
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N Engl J Med 365(6):484-6 (2011) PMID 21793739
DOI: 10.1056/NEJMp1107779
J Clin Psychiatry 71(9):1125-30 (2010) PMID 20441723