- Mail Surveys. Using addresses provided by the Directory, we will send surveys via mail to selected pediatricians. All mailings will be coded and entered into a computerized master list that will facilitate tracking of surveys received and follow-up. Surveys sent and received will be tracked. Based on prior research experience, we expect an initial response rate of approximately 50%. One month after the initial mailing, we will conduct a second mailing to non--responders, sending a reminder postcard requesting the completion and return of the survey. Two months after the initial mailing, a second letter and survey will be sent to those who still have not responded. With this method, we expect a final response rate of 60%