Geographical Variation in Kidney Function Testing and Associations With Health Care Costs Among Patients With Chronic Kidney Disease and Type 2 DiabetesByKeith A. Betts, PhD,Jinlin Song, PhD,Jay Elliott, PhD,Neil Warnock, MD, MS, CHCQM,Ryan Farej, BS,Aozhou Wu, PhD,Rakesh Singh, PhDAugust 16th 2022