Medical  echnology is a product of Net Resources International. Copyright 2018 Net Resources International, a trading division of Kable Intelligence Limited. Registered office John Carpenter House, John Carpenter Street, London, EC4Y 0AN, UK. Company registration number 03171601.All rights reserved. No part of this publication may be reproduced in any form or by any means, electronic, photocopying or otherwise, without prior permission of the publisher and copyright owner. While every effort has been made to ensure the accuracy of this publication, the publisher accepts no responsibility for errors or omissions. The products and services advertised are those of individual authors and are not necessarily endorsed by or connected with the publisher. The opinions expressed in the articles within this publication are those of individual authors and not necessarily those of the publisher.