Muscle Assessment by Ultrasonography: Agreement with Dual-Energy X-Ray Absorptiometry (DXA) and Relationship with Physical Performance. - Neira Álvarez M; Vázquez Ronda MA; Soler Rangel L; Thuissard-Vasallo IJ; Andreu-Vazquez C; Martinez Martin P; Rábago Lorite I; Serralta San Martín G (The journal of nutrition, health & aging, 2021)