Efficacy of pragmatic same-day ring prophylaxis for adult individuals exposed to SARS-CoV-2 in Switzerland (COPEP): protocol of an open-label cluster randomised trial by François Chappuis, Idris Guessous, Thomas Perneger, Manuel Battegay, Laurent Kaiser, Mikaela Smit, Frederique Jacquerioz, Annalisa Marinosci, Giovanni Jacopo Nicoletti, Silvio Ragozzino, Diego O Andrey, Dan Lebowitz, Benjamin Meyer, Herve Spechbach, Julien Salamun, Moritz Back, Carla Schaubhut, Simon Fuchs, Laurent Decosterd, Niklaus D Labhardt

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