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In such cases questionnaire was reviewed by the interviewer after being completed.
For all cases, questionnaire information on risk factors for breast cancer was collected before the diagnosis of cancer (that is, in 1992); however, collection of DNA from buffy coat occurred in 1998 to 2001, in some cases after or only slightly before cancer diagnosis.
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In these cases questionnaires will be interviewer-administered.
In all cases, questionnaires were either self-completed by literate patients, or where patients were illiterate, the questionnaires were administered by one of the authors (DÖ).
Given that data collection was undertaken by staff from each site, or in some cases, questionnaires were mailed to participants, reasons for assistance were not systematically documented.
On the whole, most tracking systems rely on project-based data provided by donors or, in some cases, questionnaires filled out by recipient country officials [ 38– 538.
While structured interviews were the primary means used to collect information from students and tutors during the site visits, in some cases questionnaires were distributed because of time and/or resource constraints.
All subjects were interviewed in English or Spanish based on the subject's language choice with an extensive, standard questionnaire modified from the initial case questionnaire.
The nurse administered a case questionnaire and requested a stool specimen.
The average interview length for completion of the case questionnaire was 28 minutes, and the average interview length for completion of the control questionnaire was 16 minutes (Table).
Birth weight and gestational age were obtained from medical records unless unavailable (3% and 36% of boys, respectively), in which case questionnaire data were used.
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