@turquoise-- I'm not surprised about that because EMR was developed in the 1980s in Japan as you suggested. The doctor who developed it wanted an alternative way to treat tumors of the stomach. Before EMR was available, the entire stomach was removed as is usually done with other tumorous organs as well. But of course, this is really traumatic for the patient, life is never same for them again.
So the goal was to remove tumors without removing the entire organ so that the patient would continue to have a high quality life after surgery. They accomplished this with EMR which removes tumors and possibly the inner lining of the stomach but that's all.
I'm sure EMR is going to be available at all major hospitals soon as more American doctors gain expertise in the procedure.