Refer to the input text as context and select the correct relationship between 'Columbia University' and 'Columbia University Medical Center' from the available options.
Options: subsidiary, manufacturer, brand, industry

He joins us from Columbia University Medical Center where he most recently served as Professor of Medicine and Experimental Therapeutics and the Director of the Center for Lymphoid Malignancies, as well as co-Program Director of the Lymphoid Development and Malignancy Program at the Herbert Irving Comprehensive Cancer Center at Columbia University Medical Center.
subsidiary