Comparison of duplicate portion and 24 h recall as reference methods for validating a FFQ using urinary markers as the estimate of true intake

Trijsburg L, de Vries JHM, Boshuizen HC, Hulshof PJM, Hollman PCH, van ’t Veer P, Geelen A. Comparison of duplicate portion and 24 h recall as reference methods for validating a FFQ using urinary markers as the estimate of true intake. Br J Nutr. 2015; 114(8): 1304–12.