[1] IRCCS Fdn G Pascale, Ist Nazl Tumori, Epidemiol & Biostat Unit, Naples, Italy
[2] Kings Coll London, Fac Life Sci & Med, Dept Biochem, Biopolymers Grp, London, England
[3] Kings Coll London, Fac Life Sci & Med, Dept Nutr Sci, London, England
[4] Univ Sussex, Brighton & Sussex Med Sch, Brighton, England
[5] Univ Naples Federico II, Dept Clin Med & Surg, Naples, Italy