Randomization
Initially six HD units (clusters) were randomized 1:1 by a statistician to the control or intervention arm. Sites were grouped according to locally connected clusters, and clusters were paired to maximize the balance between groups. All clusters were simultaneously allocated in pairs to the 2 study arms (permuted blocks of length 2). To determine the order of randomization, sites were stratified within each Australian state by metropolitan/rural status, public/private sector, prior use of PROMs, and size of site. Allocation was concealed from sites until site initiation. Of note, two private sector HD units that were randomized did not have local governance and research contract approvals in time for study commencement and were excluded. This did not affect stratification by other factors.