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NIK e.V. is an online platform where patients talk about how they cope with autoimmune diseases, furthermore you can find trustworthy background-information on autoimmune diseases, sadly as of today GPA is not one of them.
Arbeitskreis Vaskulitits is a German network of people diagnosed with vasculitits, sharing patient reports as well as background-information. Its goal is to educate the public on GPA and similar diseases to help create public awareness. For direct contact a forum has been implemented.