Division of Nephrology, Department of Medicine, Columbia University Medical Center, New York, New York

Correspondence: Dr. S. Ali Husain, Division of Nephrology, Department of Medicine, Columbia University Medical Center, 622 West 168th Street PH4-124, New York, NY 10032. Email: [email protected]

See related article, “Time-Varying Determinants of Graft Failure in Pediatric Kidney Transplantation in Europe,” on pages 345–354.