Participation in the survey is voluntary. Answering individual questions is also voluntary. If you cannot, or do not wish to, answer a specific question, you can generally skip to the next question with no problem. This is not the case for some questions, known as "filter" questions. The answers to these questions determine which follow-up questions are asked. Filter questions must be answered in order to allow for proper routing within the questionnaire.

Please note that we strive to achieve overall results that are as representative as possible. Each question you answer makes the results more representative. Your responses to questions regarding personal information and study-related information help us to assess how representative the results are.