PUBLISHED BY THE EUROPEAN RESPIRATORY SOCIETY CHIEF EDITORS Ernst Eber (Graz, Austria) Fabio Midulla (Rome, Italy) ERS STAFF Matt Broadhead, Alyson Cann, Jonathan Hansen, Sarah Hill, Elin Reeves, Claire Turner © 2013 European Respiratory Society Design by Claire Turner, ERS Typeset in China by Charlesworth Group Printed by Charlesworth Press All material is copyright to the European Respiratory Society. It may not be reproduced in any way including electronically without the express permission of the society. CONTACT, PERMISSIONS AND SALES REQUESTS: European Respiratory Society, 442 Glossop Road, Sheffield, S10 2PX, UK Tel: +44 114 2672860 Fax: +44 114 2665064 e-mail: info@ersj.org.uk ISBN 978-1-84984-038-5