. 2018 Oct 12;6:294. doi: 10.3389/fped.2018.00294
Copyright © 2018 Steinmann, Lehnick, Buettcher, Schwendener-Scholl, Daetwyler, Fontana, Morgillo, Ganassi, O'Neill, Genet, Burth, Savoia, Terheggen, Berger and Stocker.
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Figure 1.
Flow chart illustrating selection process of literature review.