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. 2020 Dec 9;133(7):351–358. doi: 10.1007/s00508-020-01795-7

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Fig. 2 — Individual time course of S1 IgG and RBD pan-Ig antibody indices. a Individual longitudinal S1 IgG index values. The dashed horizontal line indicates the cut-off point between negative and positive results. b Individual longitudinal RBD pan-Ig index values. The dashed horizontal line indicates the cut-off point between negative and positive results