Are these height differences significant??

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I have been searching for patient stories from russia and got these before and after pics from their site (ruscom)

First one says its 6 CM gain but it isn't impressive as much as I thought it would be.






Of course these patients look good after the height gain but when you compare before and after it's kind of disappointing to me. Any thoughts?

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sorry about posting on the wrong section

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Thank you for your opinions guys. I now kinda understand why some people willingly risk couple more cms to reach at least 3 inches