You might try calling Missouri Bariatrics in Columbia, I know thats not St Louis but they were going to refer me to a surgeon that had just started the procedure but I wasnt able to go because my insurance does not cover it at this time.
Hope this helps some.
Missouri Bariatrics (573) 882-5673
I Corinthians 15:57 - But thanks be to God! He gives us the victory through our Lord Jesus Christ.