Efficacité du masque ?
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![[DEBRIEF] La biostatisticienne Christine Cotton sur l’efficacité du vaccin anti-COVID Pfizer](https://sun9-41.userapi.com/Uo1veGDqr14aW9O50DNamWYQfyocy1f4Fk_Gjw/AjqsAqobmrs.jpg)
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