Have a look at Matsen's books: https://www.amazon.com/Eating-Alive-Prevention-Thru-Digestion/dp/0969358601/ref=sr_1_1?ie=UTF8&qid=1513347806&sr=8-1&keywords=eating+alive
Nothing earth shaking, but he had a lot of patients whose Ileocecal valve woudn't close properly, leading to SIBO.