1. Department of Nutrition and Dietetics, King's College London, London SE1 9NN, U.K.
2. Departments of Clinical Biochemistry, London SE5 9PJ, U.K.
3. Departments of Medicine, London SE5 9PJ, U.K.
4. Department of Clinical Biochemistry, Kingston Hospital, Kingston-upon-Thames, Surrey KT2 7QB, U.K.
5. Departments of Cardiology, King's College School of Medicine and Dentistry, London SE5 9PJ, U.K.