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"In addition to the routine standardization and calibration tests performed by the laboratory, duplicate samples for a 10% subset of the specimens were submitted to UCL and to Quest Diagnostics in the United States for analysis."
Unfortunately, that statement is not correct. It should read:
"In addition to routine standardization and calibration tests performed by the laboratory, during the early stages of fieldwork, nine individuals outside of the sample contributed triplicate sets of specimens: two sets were submitted to UCL and a third set was sent to Quest Diagnostics in the United States."
The subsequent sentence regarding our estimates of reliability/validity is correct.
The authors regret having made this error.
Related articles in Journals of Gerontology Series A: Biological Sciences and Medical Sciences:
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