Conference Comparing Average Level and Within-Person Consistency in Clinical Disability Using AVP-825 vs. Sumatriptan Tablets: Applying Location Scale Mixed-Effects Models July 11, 2017 Michael Bourke VPG’s Drs. McGinley and Wirth’s poster will be on display at the Headache Update 2017 in Lake Buena Vista, FL from July 13 to 16, 2017.