Copyright

The International Classification of Headache Disorders, 3rd edition (beta version), may be reproduced freely for scientific, educational or clinical uses by institutions, societies or individuals. Otherwise, copyright belongs exclusively to the International Headache Society. Reproduction of any part or parts in any manner for commercial uses requires the Society’s permission, which will be granted on payment of a fee. Please contact the publisher at the address below.

© International Headache Society 2013. Applications for copyright permissions should be submitted to Sage Publications Ltd, 1 Oliver’s Yard, 55 City Road, London EC1Y 1SP, United Kingdom (tel: +44 (0) 20 7324 8500; fax: +44 (0) 207 324 8600) (www.sagepub.co.uk).