Has a study been done on the short and long term effects of the Duodenal Switch?

I would like to find information on the Duodenal Switch, specifically if any studies have been conducted by INDEPENDENT researchers. Ive read a lot of testimonials from doctors but it seems like any doctor is going to talk up whatever surgery he specializes in. Have any independent studies been made comparing the DS with the proximal RNY relating to maintained longterm weight loss, malabsorption problems, vitamin deficiencies, complications, etc.? The thought of eating more with the DS sounds great but where do all those extra calories go? Also, wont the DS stomach stretch over time just like the RNY pouch? That could turn into a fair sized stomach. I read that the DS is in common practice in Europe. Maybe some longterm studies have been done there.

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