Flip-Flap Flop..Anybody knows about this?

Just this Morning, I received an email from my aunt a forwarded email.. A warning not to buy these "Chinese Thong Sandals Sold at WalMart"

I wonder if this issue is really true..but it is very alarming! See the Effect of these Chinese Thong Sandals..

Especially now that these sandal thing is in fashion..and very comfy to use..how come these was the effect?? anybody knows about this?? Don't hesitate to share your thoughts and ideas..It would be a big help.. See more details about this Here..