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Stratified Cox models with time‐varying effects for national kidney transplant patients: A new blockwise steepest ascent method
Analyzing the national transplant database, which contains about 300,000 kidney transplant patients treated in over 290 transplant centers, may guide the disease management and inform the policy of kidney transplantation. Cox models stratified by centers provide a convenient means to account for the clustered data structure, while studying more than …