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. 2018 Mar 28;33(10):953–964. doi: 10.1007/s10654-018-0384-x

Fig. 1.

Fig. 1

A flow diagram showing the number of data cases included or excluded at each stage. Note: “N” indicates numbers of total participants (i.e. participants who provided repeated measures are treated as separate data cases) and “n” indicates numbers of unique participants