The abstracts from the AAN Annual Meeting in San Diego were published online only this year, and can be viewed at: www.abstracts2view.com/aan or http://www.neurology.org/content/vol80/1_MeetingAbstracts. As they were published exclusively online, the citation is slightly different from years past and no page number is used.
The format to use for 2013 abstracts is: Authors. Title. Neurology 2013;80(Meeting Abstracts 1): Published Abstract Number.
For more detailed information about reference style, please visit the Neurology website.