The most frequent side effect was difficulty swallowing, which occurred in 68 percent of patients right after surgery. That dropped to 11 percent after one year and 4 percent after three years.
Six of the 100 had to have the device removed. In three it was because swallowing problems persisted. Other problems prompted removal in the others.
The device is available so far in 24 states.
Marilynn Marchione can be followed at http://twitter.com/MMarchioneAP
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