Checking for completeness of 24-h urine collection using para-amino benzoic acid not necessary in the Observing Protein and Energy Nutrition study.
Subar, A F 1; Midthune, D 2; Tasevska, N 1; Kipnis, V 2; Freedman, L S 3
[Article] European Journal of Clinical Nutrition. 67(8):863-867, August 2013.

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