NAVKIDS2 trial: a multi-centre, waitlisted randomised controlled trial of a patient navigator intervention in children with chronic kidney disease — statistical analysis plan and update to the protocol - Anita van Zwieten; Elizabeth G. Ryan; Patrina Caldwell; Kirsten Howard; Allison Tong; Jonathan C. Craig; Stephen I. Alexander; Martin Howell; Armando Teixeira-Pinto; Carmel M. Hawley; Shilpanjali Jesudason; Amanda Walker; et al. (Trials, 2022)