[Online surveys at www.gesundheitsinformation.de: identifying the potential need for evidence-based health information].

There is some evidence that involving patients in the development of health information can increase the relevance and understandability of this information. The German Institute for Quality and Efficiency in Health Care (IQWiG) publishes easy-to-understand and freely accessible evidence-based health information on its bilingual website gesundheitsinformation.de / informedhealthonline.org. The aim of the Institute is to determine the information needs of the general public and patients, and to take those needs into account when producing its health information. One way in which this is done is by carrying out online surveys before the information is produced, asking the users of the website about their level of interest in various aspects of a topic. In this article we present two examples of such surveys - on the topics of "endometriosis" and "skin cancer screening and prevention" - as well as the results of these surveys and how the results influenced the contents of the health information produced. Our experience with a total of seven surveys suggests that online surveys can be a helpful additional tool to identify information gaps and determine information needs and areas of special interest. In addition, surveys provide a way to interact with the users of the website. In their current form, however, online surveys also have methodological limitations that need to be considered when developing these surveys and interpreting their results.