Definition and evolution of the concept of sarcopenia Maria Luz Sanchez-Tocino; Secundino Cigarrán; Pablo Ureña; Maria Luisa González-Casaus; Sebastian Mas-Fontao; Carolina Gracia-Iguacel; Alberto Ortíz; Emilio Gonzalez-Parra;

Nitrogen and phosphorus recovery from hemodialysis wastewater to use as an agricultural fertilizer Faissal Tarrass; Hamza Benjelloun; Meryem Benjelloun;

Recommendations of the Spanish Society of Nephrology for the management of mineral and bone metabolism disorders in patients with chronic kidney disease: 2021 (SEN-MM) José-Vicente Torregrosa; Jordi Bover; Mariano Rodríguez Portillo; Emilio González Parra; María Dolores Arenas; Francisco Caravaca; María-Luisa González Casaus; Alejandro Martín-Malo; Juan Francisco Navarro-González; Víctor Lorenzo; Pablo Molina; Minerva Rodríguez; Jorge Cannata Andia;