COVID-19 vaccine effectiveness among healthcare workers in Albania (COVE-AL): protocol for a prospective cohort study and cohort baseline data حسب Richard Pebody, Marta Valenciano, Shela Sridhar, Albana Fico, Iria Preza, Iris Hatibi, Jonilda Sulo, Esther Kissling, Rovena Daja, Rawi Ibrahim, Diogo Lemos, Julia Rubin-Smith, Alexis Schmid, Adela Vasili, Pernille Jorgensen, Kathryn E. Lafond, Mark A. Katz, Silvia Bino

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