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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