Of 817 identified citations, 43 studies involving 2000 drivers and 183 effect sizes (r) were analyzed in the meta-analysis.
"If violations are identified, citations could be issued and fines proposed for the employer," said Ted Fitzgerald, the Labor Department spokesman.
DistillerSR is a 100% web-based package which allows reviewers download database identified citations.
Of 11 189 identified citations, one RCT and three observational studies met the eligibility criteria.
One author (SC) reviewed the titles and available abstracts for all identified citations, to determine relevance.
Two reviewers independently assessed the titles and abstracts of all identified citations (MZK and AG).
Two members independently reviewed titles and abstracts of all identified citations.
A reference manager programme will be used to store identified citations and their electronic text.
Two reviewers independently identified citations, extracted data, and evaluated quality using the STROBE checklist.
Two investigators (ZX, CW) independently screened the titles and abstracts of all identified citations.
