1Division of Nephrology, Department of Medicine, Columbia University, New York, New York

2Unit of Genomic Variability and Complex Diseases, Department of Medical Sciences, University of Turin, Turin, Italy

Correspondence: Dr. Simone Sanna-Cherchi, email: [email protected]

See related article, “Circulating Proteins and IgA Nephropathy: A Multiancestry Proteome-Wide Mendelian Randomization Study,” on pages 1045–1057.