The second question might be one for Dr. Sclafani's thread, as he is a doctor. (You mean do the use of those drugs make the risk bigger when undergoing the procedure itself?)
And we'll wait for someone with experience with Dr. Vogl to respond to the first question! I have definitely heard the name. Do you know how to do a search? There's an option for this near the top of the page. Type in Vogl and you might find something.