In survey research maximizing response rates is critically important in order to provide the most generalizable and unbiased results.
Multiple mailings, standardized telephone interviews, interviewer training, and methods for maximizing response rates are well established in the Health Plan Employer Data and Information Set HEDISspecificationsons [ 22].
We used the following survey methods to maximize response rate [26], [27]: university sponsorship, personalized cover letter, colored ink, stamped return envelope, first class mailing, follow up mail, including a questionnaire in the follow up mail, non-monetary incentive, and a questionnaire that is interesting, short, user friendly, and with factual questions.
To maximize response rate, we designed a short questionnaire.
To maximize response rate, a modified Dillman technique [ 6] was used.
To maximize response rate, we sent two sequential e-mails to the participants during the study period.
To maximize response rate, reminders were provided two, three, and four weeks later, by telephone and directly within units.
To maximize response rate, cover letters were addressed by local researchers affiliated with universities in the respondents' country.
To maximize response rate, a modification of Dillman's tailored design method was utilized, including a reminder letter and second mailing of surveys to respondents [ 51].
