Racial and ethnic differences in severity of coronary calcification among patients undergoing PCI: Results from a single-center multiethnic PCI registry oleh Solomon W. Bienstock, Rajeev Samtani, Ashton C. Lai, Usman Baber, Dylan Sperling, Anton Camaj, Jason Feinman, Peter Ting, Nikola Kocovic, Emily Li, Martin E. Goldman