Managing withdrawals and exclusions of study participants in COVID-19-research by NUKLEUS by Heike Valentin, Henriette Rau, Lizon Fiedler-Lacombe, Arne Blumentritt, Ekaterina Heim, Alexander Rudolph, Katrin Leyh, Monika Kraus, Bettina Lorenz-Depiereux, Irina Chaplinskaya, Christian Schäfer, Jens Schaller, Joerg Janne Vehreschild, Melanie Stecher, Margarete Scherer, Martin Witzenrath, Beate Balzuweit, Stefan Schreiber, Thomas Bahmer, Wolfgang Lieb, Steffen Cordes, Wolfgang Hoffmann, Sabine Hanß, Dana Stahl

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