{"eventGroups":[{"deathsNumAffected":0,"deathsNumAtRisk":3,"description":"Patients undergo scheduled, elective surgery for placement of the sacral nerve stimulator with external battery pack. After 2 weeks, patients undergo implantation of a subcutaneous internal battery or removal of the leads if the sacral nerve stimulator is working but does not improve symptoms. If the sacral nerve stimulator is not working, it is repositioned and patients return 2 weeks later for implantation of external battery or removal of leads.","id":"EG000","otherNumAffected":0,"otherNumAtRisk":3,"seriousNumAffected":0,"seriousNumAtRisk":3,"title":"Experimental: Sacral Nerve Stimulation (SNS)"}],"frequencyThreshold":"0","timeFrame":"From visit 1, up to 3 years"}