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2 4 6 8 10 12 14 16 

 WEEKS 



100% 

 80 

 60 

 40 

 20 



6 8 10 12 14 16 



WEEKS 



100% 

 80 > 

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40 a 



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20 * 



2 4 6 8 10 12 14 16 

 WEEKS 



Figure 2 



