Variations in COVID-19 vaccine hesitancy over time: a serial cross-sectional study in five West African countries by Seydou Doumbia, Kadari Cisse, Henri Gautier Ouedraogo, Dewi Ismajani Puradiredja, Jürgen May, Sylvain Landry Faye, Daniela Fusco, Moctar Tounkara, Ricardo Strauss, Tani Sagna, Alpha Mahmoud Barry, Abdul Karim Mbawah, Cheick Oumar Doumbia, Souleymane Diouf, Federico Di Meglio, Edouard Lhomme

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Challenges of conducting an international observational study to assess immunogenicity of multiple COVID-19 vaccines. by Ratna Sardana, Placide Mbala Kingebeni, Wiwit Agung Snc, Abdoul H Beavogui, Jean-Luc Biampata, Djeneba Dabitao, Paola Del Carmen Guerra de Blas, Dehkontee Gayedyu-Dennis, Mory C Haidara, Ganbolor Jargalsaikhan, Garmai Nyuangar, Asep Purnama, Guillermo Ruiz Palacios, Seydou Samake, Moctar Tounkara, Shera Weyers, Delgersaikhan Zulkhuu, Sally Hunsberger, Renee Ridzon

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