nutrients Article Relative Validity of a Beverage Frequency Questionnaire Used to Assess Fluid Intake in the Autosomal Dominant Polycystic Kidney Disease Population Carly Mannix 1,2, * ID , Anna Rangan 3 ID , Annette Wong 1,2 , Jennifer Zhang 1,2 , Margaret Allman-Farinelli 3 and Gopala Rangan 1,2 1 Centre for Transplant and Renal Research, The Westmead Institute for Medical Research, The University of Sydney, Westmead, NSW 2145, Australia; annette.wong@sydney.edu.au (A.W.); jennifer.zhang@sydney.edu.au (J.Z.); g.rangan@sydney.edu.au (G.R.) 2 Department of Renal Medicine, Westmead Hospital, Western Sydney Local Health District, Westmead, NSW 2145, Australia 3 School of Life and Environmental Sciences, The Charles Perkins Centre, The University of Sydney, Sydney, NSW 2006, Australia; anna.r

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