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A total of 1,200 questionnaires (with cover letters) were distributed on site by one of the authors.
All subjects were handed questionnaires with cover letters which contained information detailing the objectives and methodology of research and consent forms.
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A replacement questionnaire with cover letters was sent to non-respondents four weeks after the first questionnaire mail-out.
In 2006, these patients received questionnaires with a cover letter sent by their health insurance provider.
In the spring of 2003, a total of 55 survey packages (questionnaires with informational cover letters) were distributed across the five participating health centres.
In September to December 2009 we sent the questionnaire with a cover letter to 387 staff to complete and post back to the research team.
All gynecologists were approached by mail and received a questionnaire with a cover letter and prepaid return envelope.
A one-page questionnaire with a cover letter was sent by fax.
Two weeks before study initiation, each participant received a questionnaire with a cover letter emphasizing confidentiality; each questionnaire was filled out anonymously.
A questionnaire with a cover letter explaining the study objective was distributed to each parent's pigeonhole in the childcare facility.
A questionnaire with a cover letter, postage-paid envelope and information about the possibility of using fax or email was mailed to each of the 167 pediatricians practicing in the state of Thuringia in February 2009, with data collection beginning immediately thereafter.
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