Trained research assistants consult the medical record to verify visit attendance.
In our study, E2 antibody was not developed in the patients who cleared de GBV-C virus, verified at visit 5 (after one year of enrollment) therefore, our results may underestimate the lifetime of the GBV-C infection.
This information can easily be verified by visiting the official website of the nursing board for the state where you plan on attending nursing school.
The accuracy of land-use categories was directly verified during site visits.
The list will be verified by site visits.
All cancer diagnoses are verified through home visits and medical chart review to ensure pathological confirmation.
The vital status of the unmatched incident cases is then verified by home visits or postal/telephone enquiries.
Source documentation and data accuracy will be verified by site visits in randomly selected 2% of the sites.
Stomach cancer cases were identified through annual record linkage to the Shanghai Cancer Registry, and verified through home visits and review of medical charts.
All possible cancer cases were further verified through home visits and further review of medical charts by clinical and/or pathological experts.
