My point, ratter, is that I can't understand why people introduce the foreign body in the first place, when most people know the harm they can do. Just read the posts - the potential for harm (eg septicaemia) is enormous. And incidentally, please don't assume that I don't know what I am talking about, just because you don't agree with me. You know nothing about me, you don't know my profession, my qualifications or my experience. If you disagree with me, that is fine, and I respect your opinion - but i would never assume that you don't know what you are talking about, just because I don't share your view.