Original sentence: It is practiced chiefly in Brazil and the Philippines, and is performed by psychic doctors or psychic surgeons, who say they extract "tumors" or other pathological objects such as pus or bones from the patient's body through an incision
Edited sentence: It is practiced chiefly in Brazil and the Philippines, and is performed by psychic doctors or psychic surgeons, non-medical-professionals who say they extract "tumors" or other pathological objects such as pus or bones from the patient's body through an incision