Martins-Filho, Paulo Ricardo, Universidade Federal de Sergipe, Hospital Universitário. Rua Cláudio Batista, s/n. Bairro Sanatório. Aracaju, Sergipe, Brasil. CEP: 49060-100. E-mail: prmartinsfh@gmail.com, Brazil

• EXCLI Journal Vol. 21 (2022) - Letters to the editor
  Poorer and more densely populated regions have lower vaccination capability against COVID-19
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