Division of Gastroenterology,Allegheny Health Network,Pittsburgh,PA 15212,United States;
Allegheny Singer Research Institute,Allegheny Health Network,Pittsburgh,PA 15212,United States;
Division of Radiation Oncology,Allegheny Health Network Cancer Institute,Pittsburgh,PA 15212,United States;
Colorectal; cancer; Early-onset; colorectal; cancer; Colorectal; cancer; screening; Epidemiology; analysis; Colorectal; neoplasm; Average-risk; screening;