The information in this book has been compiled by way of general guidance in relation to the specific subjects addressed. It is not a substitute and not to be relied on for medical, healthcare, pharmaceutical or other professional advice on specific circumstances and in specific locations. Please consult your GP before changing, stopping or starting any medical treatment. So far as the author is aware the information given is correct and up to date as at June 2017. Practice, laws and regulations all change, and the reader should obtain up-to-date professional advice on any such issues. The author and publishers disclaim, as far as the law allows, any liability arising directly or indirectly from the use, or misuse, of the information contained in this book.