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We used simple questions using a standardised electronic questionnaire protocol, but there could be some adolescents who misunderstood our questions.
Being summoned for a follow-up visit (protocol A) vs. receiving a postal questionnaire (protocol B) was used as exposition variable.
For the non-respondents, there were no statistically significant differences in outcomes between those who did not attend the outpatient clinic (protocol A) and those who did not respond to a postal questionnaire (protocol B) (data not shown).
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Questionnaires, protocol analysis, and cognitive sketch maps were used to examine these connections.
Patients (operated in 2002 and 2003) who only received postal questionnaires (protocol B) at 2 years of follow-up were less likely to respond than those who were summoned for a follow-up visit at the outpatient clinic (protocol A) (odds ratio (OR) = 3, 95% CI: 2 5).
The study procedures, questionnaires, protocols and consent process were reviewed and approved by the Institutional Review Board of the Centers for Disease Control and Prevention.
Clinical and epidemiologic data was harmonized across the two studies through a systematic evaluation of individual study questionnaires, protocols, and data dictionaries.
During the first step of the study, the researchers will be received training weekly during one year, based on questionnaires, protocols and anthropometrics measures, and invited experts in the area: psychiatrist, neurologist and pediatrics.
The NAMRU-3 IRB, Cairo, Egypt, approved the original data collection using the self-report deployment health questionnaire, under protocol DoD# NAMRU3.2005.0012.
We also excluded those faculty members who have reviewed the study questionnaire and protocol previously during its development and finalization phase.
Apart from the questionnaire, the protocol involves a single blood sampling of 25 ml as main discomfort for cases and controls.
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