Duodenal Switch vs. Roux-en-Y

I am considering weight loss surgery and am trying to decide which is best for me. Does anyone know of specific guidelines to be a canidate for the Duodenal Switch? From my readings it seems to be done much less than the Roux-en-Y, but sounds like a great option. I wonder why it is done less. I wondered if it is for people with extremely high BMIs. I appreciate any information you can share.

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