Cardiovascular risk in subjects over 55 years of age and cognitive performance after five years. NEDICES2-RISK study. Study protocol - Ester Tapias-Merino; María Del Canto De Hoyos-Alonso; Israel Contador-Castillo; Emiliano Rodríguez-Sánchez; Teresa Sanz-Cuesta; Concepción María Becerro-Muñoz; Jesús Hernández-Gallego; Saturio Vega-Quiroga; Félix Bermejo-Pareja; NEDICES2-RISK Group (PloS one, 2022)