Validity of self-reported pneumococcal vaccination status in the elderly in Spain.
Bayas JM, Izquierdo C, Ruiz L, Sintes X, Sousa D, Celorrio JM, Varona W, Carratalà J, Nebot M, Batalla J, Sugrañes S, Manzur A, Terren A, García C, Clemente E, Rivera S, Justo I, Arévalo A, Salleras L, Domínguez A.
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