1. Division of Nutrition and Dietetics, College of Pharmacy and Nutrition, University of Saskatchewan, 110 Science Place, Saskatoon, SK Canada S7N 5C9.
2. Corresponding author. E-mail: STEPHEN@SASK.USASK.CA Phone: 306/966-5847. Fax:306/966-6377.
3. MRC Dunn Clinical Nutrition Centre, Hills Road, Cambridge CB2 2DH England.