I understand "outside experts" as "experts who are not among the authors of this original article." Am I on the right track?
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We obtained data regarding cases outside Hubei province from the National Health Commission. Because of the high workload of clinicians, three outside experts from Guangzhou performed raw data extraction at Wuhan Jinyintan Hospital, where many of the patients with Covid-19 in Wuhan were being treated.
Source: New England Journal of Medicine
https://www.nejm.org/doi/full/10.1056/NEJMoa2002032
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We obtained data regarding cases outside Hubei province from the National Health Commission. Because of the high workload of clinicians, three outside experts from Guangzhou performed raw data extraction at Wuhan Jinyintan Hospital, where many of the patients with Covid-19 in Wuhan were being treated.
Source: New England Journal of Medicine
https://www.nejm.org/doi/full/10.1056/NEJMoa2002032