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While the CPAP machine is the most effective way to treat sleep apnea, some patients, like veteran David Cotter, can’t tolerate the mask that users have to wear at night.

David Hartzler was the epitome of health. A former collegiate swimmer, he had continued the sport into adulthood. Three times a week, the Lawrence, Kan., resident swam 3,000 meters with the Lawrence Masters Swim Club.