The health and economic burden of invasive pneumococcal diseases attributable to PCV21 versus PCV20 serotypes among adults aged ≥ 45 years in Spain - Muloongo Simuzingili; Silvia Fernández-Soberón; Zinan Yi; Nicole Cossrow; Kelly D. Johnson; Kwame Owusu-Edusei (BMC Public Health, 2026)