Dr. Johnson's last concern focuses on the quality of our surveys. A comparable survey was sent to parents of both groups of children. As noted in our article, the survey included items assessing past medical history, medications taken at the time of death, a list of medical problems, and the use of over-the-counter and prescription medications. A history of sudden death among relatives was also assessed. The items assessing medication use were open-ended and did not ask about any one specific class of medication, including stimulants. The reasons for taking the medication(s), and the frequency and duration of use, were also asked. While we cannot rule out the possibility that parents of children in the sudden unexplained death group remembered stimulant medications more vividly than parents of children who died in accidents, we remain confident that the association of sudden death and stimulant medication use is valid because our sensitivity analyses suggest that the strength of the association was not sensitive to the source of stimulant measurement.