WCN24-713 ONLINE HEMODIAFILTRATION IS MORE EFFICIENT THAN HIGH FLOW HEMODIALYSIS IN THE CLEARANCE OF MEDIUM WEIGHT MOLECULES RENDERING AS BETA 2 MICROGLOBULIN - Ricardo Silvariño; Florecia Brovetto; Cecilia Baccino; Sofia San Román; Oscar Noboa; Soledad Lecueder (Kidney International Reports)