<qa>  What is the risk of clot formation?Participants will have their vital signs temperature, pulse, breathing, blood pressure taken before and one hour after treatment. All side effects during course one will be reviewed and, if no serious side effects took place, the participant may have additional courses. A pill may be given by mouth every day to decrease the risk of clot formation or a pill for diarrhea, nausea, andor vomiting if the doctor believes that participants may need it. 