Figure S1. Example of a question presented in the knowledge test.

Figure S2. Fitted regression curves for RI (in months) as predictor and percentage corrects answers (unrehearsed knowledge) as predicted variable.

Figure S3. Percentage retention unrehearsed basic science knowledge, anatomy versus other disciplines, for different RI groups.

Table S1. Distribution of the number of observations falling into various retention intervals; data from 5th and 6th year students.

Table S2. Results of the regression analysis (linear and non-linear) with RI (months) as predictor variable and percentage corrects answers as predicted variable.

Appendix S1. Examples of questions.

Appendix S2. Questions which were rated by many physicians as ‘never known’.

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