I have plotted Kaplan-Meier Survival curve for 7 different groups by using prism 6.0 software. I want to analyze the significance among these groups by using Log-Rank test (Mantel-Cox test). Can anyone give me suggestion, how can I perform this operation in prism? Any link or paper or suggestions are most welcome. 

I have marked in yellow color in page 5 with my attached paper.

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