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The principal investigator made the interviews by using interview guides for the in-depth interviews.
Exposures occurring 2 6 weeks before illness onset (case-patients) and before interview (controls) were recorded by telephone by using a standardized questionnaire.
The use of services by patients in the six months before interview was measured using an adapted version of the Client Service Receipt Inventory [ 13].
A structured interview was conducted by using a close-ended questionnaire after the donor signed the informed consent form and before the screening.
The qualitative interviews were analyzed by using simple content analysis.
Participants' present alcohol intake, defined by the level of consumption during the week before examination, was evaluated by interview using a questionnaire that was administered, as far as possible, along with the food frequency questionnaire.
A similar result was found by using body mass index 1 year before diagnosis for cases and before interview for controls.
All participants were interviewed at two points in time: baseline (before launching the campaign) and follow-up assessment (after the campaign was finished) by using a validated instrument.
Confidentiality and anonymity were assured before they were interviewed using a structured questionnaire by a single female interviewer.
All women signed a consent form before being interviewed using FFQ.
We therefore ensured that all respondents confirmed their statements by sending them feedback from the interviews before using them in the study.
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CEO of Professional Science Editing for Scientists @ prosciediting.com