. 2020 Oct 28;7:582387. doi: 10.3389/fnut.2020.582387
Copyright © 2020 Brandl, Skurk, Rennekamp, Hannink, Kiesswetter, Freiherr, Ihsen, Roosen, Klingenspor, Haller, Krautwurst, Hofmann, Linseisen, Volkert and Hauner.
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Figure 1.
Flowchart of the recruitment process in the four age groups.