. 2020 Aug 6;7:418. doi: 10.3389/fmed.2020.00418
Copyright © 2020 Xue, van Bilsen, Schreurs, van Velthoven, Missotten, Thiadens, Kuijpers, van Biezen, Dalm, van Laar, Hermans, Dik, van Daele and van Hagen.
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Figure 1.
Flowchart study population.