1. Validation of dietary assessment methods in the UK arm of EPIC using weighed records, and 24-hour urinary nitrogen and potassium and serum vitamin C and carotenoids as biomarkers;International Journal of Epidemiology,1997
2. A coefficient of agreement for nominal scales;Educational and Psychological Measurement,1960
3. EPIC-Norfolk: study design and characteristics of the cohort. European Prospective Investigation of Cancer;British Journal of Cancer,1999