Assessing the potency of oral polio vaccine kept outside of the cold chain during a national immunization campaign in Chad von Zipursky, Simona, Boualam, Liliane, Cheikh, Dah Ould, Fournier-Caruana, Jacqueline, Hamid, Djabar, Janssen, Mathias, Kartoglu, Umit, Waeterloos, Genevieve, Ronveaux, Olivier

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