Additional file 4: of Serious kidney disease in pregnancy: an Australian national cohort study protocol SafiNadom SullivanElizabeth LiZhuoyang BrownMark HagueWilliam McDonaldStephen PeekMichael MakrisAngela O’BrienAngela JESUDASONSHILPANJALI 2019 Selected covariates: The list of variables that we expect to be associated with the outcomes. (DOCX 13 kb)