If you have questions about the VNS and feel that your doctor is not answering them try asking the FDA yourself at the link listed below. The FDA usually replies within a few days. I've noticed that there are certain questions that the FDA purposely try to avoid answering. If their reply either ignors of fails to completely answer the question you asked just keep on asking until you get that answer. Ask to have your question forwarded to their superior if you have to. Keep at them until you get a satisfactory answer.


http://www.fda.gov/comments.html