When we start writing or updating information on a particular topic, we do a thorough systematic search in various medical databases first. We then select the research that is relevant for the topic. This process is called “ screening.” In order not to overlook any important publications, the search results are checked by at least two scientists working independently of each other.
German Network for Evidence-based medicine. Chronic. 2020.
Institute for Quality and Efficiency in Health Care (IQWiG, Germany). General methods. Version 7.0. Cologne: IQWiG; 2023.
IQWiG health information is written with the aim of helping people understand the advantages and disadvantages of the main treatment options and health care services.
Because IQWiG is a German institute, some of the information provided here is specific to the German health care system. The suitability of any of the described options in an individual case can be determined by talking to a doctor. informedhealth.org can provide support for talks with doctors and other medical professionals, but cannot replace them. We do not offer individual consultations.
Our information is based on the results of good-quality studies. It is written by a team of health care professionals, scientists and editors, and reviewed by external experts. You can find a detailed description of how our health information is produced and updated in our methods.
Stay informed
Subscribe to our newsletter or newsfeed. You can find our growing collection of films on YouTube.