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The questionnaire package was self-administered or by a research assistant upon request.
All eligible participants will be mailed a study package including invitation to participate, consent form, a research questionnaire to collect data regarding family history, reproductive and lifestyle factors, as well as screening and surgery.
At baseline, the questionnaire package was self-administered by the patients, or by a research assistant upon patient's request.
The study techniques include documentary research, questionnaire survey and interviews.
40468_2014_21_MOESM1_ESM.docx Additional file 1: Summary writing research questionnaire.
Participation involved completing a questionnaire package in hospital, and at one, four, and twelve months post-injury.
A questionnaire package with retrospective items were distributed.
As well, these adolescents took a questionnaire package home of which 1 324 (69.2%) parent questionnaires were returned.
Up to two reminders with the questionnaire package were sent at two-weekly intervals if the package was not returned.
Of a consecutive sample of 444 patients to whom a questionnaire package was posted, 220 (49%) returned the questionnaires.
The participants were asked to complete a paper-and-pencil questionnaire package and return the completed questionnaires immediately.
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