[1] Mt Sinai Hosp, Joseph & Wolf Lebovic Ctr, Dept Pathol & Lab Med, Toronto, ON M5T 3L9, Canada
[2] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[3] Univ Hlth Network, Dept Clin Biochem, Toronto, ON, Canada
[4] Univ Pittsburgh, Med Ctr, Div Gastroenterol Hepatol & Nutr, Pittsburgh, PA USA
[5] Univ Hosp Mannheim, Dept Surg, Mannheim, Germany
[6] Univ Arkansas Med Sci, Winthrop P Rockefeller Canc Inst, Dept Pharmaceut Sci, Little Rock, AR 72205 USA
[7] Canc Res Unit, Lab Clin Biochem, Barcelona, Spain