RT Journal Article SR Electronic T1 Spot PC ratio estimates of 24-hour proteinuria are more unreliable in lupus nephritis than in other forms of chronic glomerular disease JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 475 OP 476 DO 10.1136/annrheumdis-2013-203790 VO 73 IS 2 A1 Daniel J Birmingham A1 Ganesh Shidham A1 Annalisa Perna A1 Derek M Fine A1 Michael Bissell A1 Roger Rodby A1 Giuseppi Remuzzi A1 Michele Petri A1 Paul Hebert A1 Brad H Rovin A1 Lee A Hebert YR 2014 UL http://ard.bmj.com/content/73/2/475.abstract AB