AMAZON SMILE

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Maybe you are customer at Amazon? With Amazon Smile there is an opportunity to donate 0.5% of the spent money to charitable organisations without increasing your bill. GISVA is registered at Amazon Smile.
If you have an Amazon Login, you may consider to register GISVA (Deutsche interdisziplinäre Gesellschaft für Gefäßanomalien e.V.) as supported organisation under https://smile.amazon.de/