Precision of the doubly-labelled water method in a large-scale application: evaluation of a streamlined-dosing protocol in the Observing Protein and Energy Nutrition (OPEN) study. - Trabulyi,J.; Troiano,R.P.; Subar,A.F.; Sharbaugh,C.; Kipnis,V.; Schatzkin,A.; Schoeller,D.A. (Eur J Clin Nutr, 2003)