Derek rings the bell signifying his completion of chemotherapy treatments on Friday, Dec. 27, 2019, at Sanford Children's Hospital in Sioux Falls, S.D. (Abigail Dollins/The Argus Leader via AP)
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Derek rings the bell signifying his completion of chemotherapy treatments on Friday, Dec. 27, 2019, at Sanford Children's Hospital in Sioux Falls, S.D. (Abigail Dollins/The Argus Leader via AP)
