0 a letter that contains information about the thing it is sent with:
1 → covering letter
Of the 17,000 sampled individuals, 2,151 were sent the eight-page questionnaire with a cover letter (available from the authors).
The survey cover letter and the method assured respondents of confidentiality.
Next, a personalized cover letter including informed consent documentation, a questionnaire and a return business envelope was mailed.
Each mailed survey was accompanied by a small gift, a hand-signed cover letter and a self-addressed stamped envelope.
A cover letter instructed the director to forward the instrument to the chairperson of the hospital's ethics committee.
A cover letter introduced the study and assured confidentiality.
The cover letter explained that the survey would be both confidential and anonymous.
Each instrument was provided with a cover letter explaining the study purpose, the protection of personal information, and that all participation was voluntary.
