Validation of the Spanish version of the Amsterdam Preoperative Anxiety and Information Scale (APAIS) - Vergara-Romero, M; Morales-Asencio, J M; Morales-Fernández, A; Canca-Sanchez, J C; Rivas-Ruiz, F; Reinaldo-Lapuerta, J A (Health Qual Life Outcomes, 2017)