Literature searching, dataabstraction and quality appraisal were performed by two investigators.
2
Restaging to the 2002 TNM system and comorbidity dataabstraction were performed.
3
Screening and dataabstraction were conducted in duplicate using systematic methods.
4
A standardized dataabstraction form was used to organize the results by NGO sector.
5
Independent reviewer pairs charted data from eligible studies using a standardized dataabstraction tool.
6
We synthesized findings through a three-step process using semi-structured dataabstraction tools and group consensus.
7
Standardized methods of searching and dataabstraction were used.
8
Screening search results, dataabstraction, and risk of bias assessment were conducted by two reviewers independently.
9
We followed standard systematic review methodology for the selection, dataabstraction, and risk of bias assessment.
10
Two reviewers independently screened citations and full-texts, and one reviewer and one verifier performed dataabstraction.
11
Two assessors reviewed titles, abstracts, and full articles using standardised dataabstraction forms and assessed study quality.
12
Full-text screening, dataabstraction, and quality appraisal were completed by a single reviewer and verified by a second.
13
Several dataabstraction forms were developed to collect historical and current exposure information and employees' work histories, starting in 1950.
14
Some variability in stroke subtype classification will remain because of inconsistencies in the medical record and errors in dataabstraction.
15
Two reviewers independently abstracted data regarding study design, setting and findings related to reliability, validity, feasibility and effectiveness using a standard dataabstraction form.
16
Dataabstraction was performed by one reviewer and verified by a second reviewer.