18 Edwards BK, Ward E, Kohler BA, Eheman C, Zauber AG, Anderson RN, et al. (2010)
Annual report to the nation on the status of cancer, 1975-2006, featuring colorectal cancer trends and impact of interventions (risk factors, screening, and treatment) to reduce future rates. Cancer 116: 544-73.
26 Institute of Medicine (2001)
Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. National Academic Press, Washington, USA.