in order to study the effect of urbanization on the epidemiological features of colo-rectal cancer in japan , the age-adjusted death rates ( aadrs ) for right-sided ( cecum , ascending and transverse ) colon , left-sided ( descending and sigmoid ) colon and rectum cancers during three periods , 1969-71 , 1974-76 and 1979-81 , were compared among five areas with different population sizes ;
C0009368
colo
C0227391
sigmoid