Study protocol for Vascular Access outcome measure for function: a vaLidation study In hemoDialysis (VALID) oleh Andrea K. Viecelli, Armando Teixeira-Pinto, Andrea Valks, Richard Baer, Roy Cherian, Pietro E. Cippà, Jonathan C. Craig, Ranil DeSilva, Allison Jaure, David W. Johnson, Charani Kiriwandeniya, Pascal Kopperschmidt, Wen-J Liu, Timmy Lee, Charmaine Lok, Krishan Madhan, Alistair R. Mallard, Veronica Oliver, Kevan R. Polkinghorne, Rob R. Quinn, Donna Reidlinger, Matthew Roberts, Bénédicte Sautenet, Lai Seong Hooi, Rob Smith, Maarten Snoeijs, Jan Tordoir, Tushar J. Vachharajani, Raymond Vanholder, Liza A. Vergara, Martin Wilkie, Bing Yang, Theodore H. Yuo, Li Zou, Carmel M. Hawley, on behalf of the VALID Investigator Team