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. 2021 Jul 9;17(1):173–180. doi: 10.1007/s11739-021-02802-z

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© The Author(s) 2021

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Fig. 3 — Individual learning curve of 12 participants (color) by date. Longer training gaps are annotated with a red line. A retention measurement was taken ~ 4.5 months after the last dive and more than 6 months after initial training