Rural-urban difference in colorectal cancer mortality

[...]the study assumed the difference in responses to colorectal cancer screening between rural and urban residents - interestingly, however, few differences were found [1]. [...]what is the worldwide status of the rural-urban difference in colorectal cancer mortality, which is an ultimate outcome of screening? [...]one study reported that the mortality risk was high in urban areas [2], while two studies reported that the mortality risk was high in rural areas [3, 5].