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| United States, Illinois | |||||
| University of Chicago Cancer Research Center | |||||
| Chicago, Illinois, United States, 60637-1470 | |||||
| United States, Iowa | |||||
| Holden Comprehensive Cancer Center at The University of Iowa | |||||
| Iowa City, Iowa, United States, 52242-1009 | |||||
| United States, North Carolina | |||||
| Comprehensive Cancer Center at Wake Forest University | |||||
| Winston-Salem, North Carolina, United States, 27157-1082 | |||||
| Cancer and Leukemia Group B |
| National Cancer Institute (NCI) |
| Study Chair: | Todd M. Zimmerman, MD | University of Chicago |